Betbrain - Betbrain.cn

Overview

Snoop Summary for betbrain.cn

This is a free and comprehensive report about betbrain.cn. The domain betbrain.cn is currently hosted on a server located in Germany with the IP address 195.201.186.152, where the local currency is EUR and German is the local language. If betbrain.cn was to be sold it would possibly be worth $262 USD (based on the daily revenue potential of the website over a 24 month period). Betbrain.cn receives an estimated 121 unique visitors every day - a decent amount of traffic! This report was last updated 30th April, 2020.

About betbrain.cn

Site Preview:
Title:
Description:
Keywords and Tags:	gambling related, games
Related Terms:
Fav Icon:
Age:
Domain Created:
Domain Updated:
Domain Expires:

Review

Snoop Score

1/5

Valuation

$262 USD

Note: All valuation figures are estimates.

Popularity

Low

Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank:	7,844,420
Alexa Reach:	<0.0001%
SEMrush Rank (US):
SEMrush Authority Score:
Moz Domain Authority:	0
Moz Page Authority:	0

Organic vs Paid (Google Ads)

Traffic

Visitors

Daily Visitors:	121
Monthly Visitors:	3,683
Yearly Visitors:	44,165

Note: All visitors figures are estimates.

Visitors By Country

Revenue

Daily Revenue:	$0 USD
Monthly Revenue:	$10 USD
Yearly Revenue:	$126 USD

Note: All revenue figures are estimates.

Revenue By Country

SEO

Backlinks Analysis (SEMrush)

Top Ranking Keywords (US)

Domain Analysis

	Value	Length
Domain:	betbrain.cn	11
Domain Name:	betbrain	8
Extension (TLD):	cn	2

Page Speed Analysis

Average Load Time:
Load Time Comparison:

Avg. (All Categories)

Performance

Accessibility

Best Practices

SEO

Progressive Web App

0–49 (Fail) 50–89 (Average) 90–100 (Pass)

Simulate loading on desktop

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for betbrain.cn. This includes details about optimizing page load times which can result in a better user experience.

Other

Estimated Input Latency — 20 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive betbrain.cn as laggy when the latency is higher than 0.05 seconds.

Network Requests
Below is a list of network requests that were made during page load.

URL	Start Time (Ms)	End Time (Ms)	Transfer Size (Bytes)	Resource Size (Bytes)	Status Code	MIME Type	Resource Type
http://betbrain.cn/	0	240.84399989806	180	0	301
https://www.betbrain.cn/	241.29099980928	885.8679998666	15294	66246	200	text/html	Document
https://www.googletagmanager.com/gtag/js?id=UA-613177-11	906.057999935	954.76699993014	30890	81635	200	application/javascript	Script
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	906.37399978004	1872.5299998187	737367	737058	200	text/css	Stylesheet
https://assets1.betbrain.com/ComponentLoader.js	906.67099994607	1358.8129999116	2513	5279	200	application/javascript	Script
https://script.opentracker.net/?site=betbrain.com	906.94499993697	1220.6849998329	1815	3694	200	text/javascript	Script
https://gfxnew1.betbrain.com/logo-l.png	907.19800000079	1382.1250000037	10353	10409	200	image/png	Image
https://www.betbrain.cn/assets/img/logo-s.svg	961.75399981439	1410.1399998181	2011	1701	200	image/svg+xml	Image
https://gfxnew1.betbrain.com/18.png	1385.4839999694	1527.9219998047	2622	2587	200	image/png	Image
https://www.google-analytics.com/analytics.js	1411.2919999752	1418.5269998852	18794	45229	200	text/javascript	Script
https://www.google-analytics.com/r/collect?v=1&_v=j81&a=437833786&t=pageview&_s=1&dl=https%3A%2F%2Fwww.betbrain.cn%2F&ul=en-us&de=UTF-8&sd=24-bit&sr=800x600&vp=1350x940&je=0&_u=IEBAAUAB~&jid=678053653&gjid=568139559&cid=1060655651.1588252561&tid=UA-613177-11&_gid=947280574.1588252561&_r=1&gtm=2ou4f0&z=265236534	1464.2939998303	1468.7669998966	580	35	200	image/gif	Image
https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,500,500i,700,700i,900	1881.242999807	1894.6159998886	2036	21311	200	text/css	Stylesheet
https://fonts.googleapis.com/css?family=Roboto+Slab:400,700	1881.4999999013	1897.106999997	1429	4196	200	text/css	Stylesheet
https://inactive.opentracker.net/collect.jsp?p=1&mid=67.205.137.127:1588252560693&fv=true&ti=&si=betbrain.com&sh=600&sw=800&sc=24&lc=https%3A//www.betbrain.cn/&ref=&t0=1588252560693	1915.4279998038	2006.2289999332	0	0	-1		Image
	1938.5119997896	1938.594999956	0	3286	200	image/png	Image
https://www.betbrain.cn/assets/img/loader.gif	1942.631999962	2048.3249998651	12575	12267	200	image/gif	Image
https://fonts.gstatic.com/s/roboto/v20/KFOlCnqEu92Fr1MmWUlfBBc4.woff2	1948.8979999442	1953.1149999239	16415	15816	200	font/woff2	Font
	1950.945999939	1999.0679998882	81284	81284	200	application/font-woff	Font
https://fonts.gstatic.com/s/roboto/v20/KFOmCnqEu92Fr1Mu4mxK.woff2	1952.8699999209	1957.2119999211	16308	15736	200	font/woff2	Font
https://www.betbrain.cn/build/app.js?v=rev_d202004280846	2001.2509999797	3180.9149999171	2327957	2327617	200	application/javascript	Script
https://static.hotjar.com/c/hotjar-532900.js?sv=5	2011.2609998323	2381.6489998717	2100	3351	200	application/javascript	Script
https://loader.wisepops.com/get-loader.js?v=1&site=JLHLkBS6nY	2011.4599999506	2125.6429997738	586	0	404	text/javascript	Script
https://script.hotjar.com/modules.d61d1be43f8e88ae5ef9.js	2387.8469998017	2438.2609999739	71634	376497	200	application/javascript	Script
https://vars.hotjar.com/box-469cf41adb11dc78be68c1ae7f9457a4.html	2448.7849997822	2476.5939998906	1353	2063	200	text/html	Document
https://newbbfeapi.betbrain.cn/httphs?method=get	3776.4109999407	4218.9129998442	730	47	200	application/json	Fetch
https://newbbfeapi.betbrain.cn/websocket/info?t=1588252563736	4229.4349998701	4388.8979998883	462	78	200	application/json	XHR
https://newbbfeapi.betbrain.cn/websocket/934/1f1cffebf8fd486a85aa4287d273efe4_2/xhr_streaming?t=1588252563917	4410.592999775	4554.0029997937	99	0	403	text/plain	XHR
https://newbbfeapi.betbrain.cn/websocket/934/1f1cffebf8fd486a85aa4287d273efe4_3/xhr?t=1588252564062	4555.2789999638	4664.5009999629	99	0	403	text/plain	XHR

Show Details

Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.

Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.

Tasks
Below is a list of the top-level main thread tasks that executed during page load.

Start Time (Ms)	End Time (Ms)
918.533	12.083
934.486	10.136
991.775	6.654
998.986	13.456
1440.066	8.643
1453.423	40.695
1904.764	30.706
1938.689	11.915
1950.782	70.047
2036.619	112.983
2157.268	12.557
2412.535	8.937
2467.124	5.194
2484.929	47.344
2532.419	7.451
2546.406	5.379
2551.838	5.204
3311.831	466.287
3778.884	9.283
3788.192	7.321
3799.761	7.269
4250.54	5.405
4418.664	6.634
4696.735	26.516
4732.593	8.076

Show Details

Diagnostics
Below is a collection of useful page vitals.
View Data

Metrics
Below is a collection of metrics.
View Data

Opportunities

Properly size images
Images can slow down the page's load time. Betbrain.cn should consider serving more appropriate-sized images.

Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Betbrain.cn should consider lazy-loading offscreen and hidden images.

Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Betbrain.cn should consider minifying CSS files.

Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Betbrain.cn should consider minifying JS files.

Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.

Serve images in next-gen formats
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.

Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.

Avoid multiple page redirects — Potential savings of 190 ms
Redirects can cause additional delays before the page can begin loading. Betbrain.cn should avoid multiple or unnecessary page redirects.

URL	Time Spent (Ms)
(Start) http://betbrain.cn/	0
https://www.betbrain.cn/	190

Show Details

Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Betbrain.cn should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.

Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.

Diagnostics

Avoids an excessive DOM size — 363 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.

Statistic	Element	Value
Total DOM Elements		363
Maximum DOM Depth	SHOW DETAILS	13
Maximum Child Elements	SHOW DETAILS	25

Show Details

Avoid chaining critical requests — 8 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Betbrain.cn should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.

JavaScript execution time — 0.6 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.

URL	Total CPU Time (Ms)	Script Evaluation (Ms)	Script Parse (Ms)
https://www.betbrain.cn/build/app.js?v=rev_d202004280846	527.362	488.997	37.284
Other	378.432	11.298	1.979
https://script.hotjar.com/modules.d61d1be43f8e88ae5ef9.js	53.427	46.981	6.446

Show Details

Minimizes main-thread work — 1.1 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.

Category	Time Spent (Ms)
Script Evaluation	624.12
Rendering	117.78
Other	114.034
Style & Layout	94.391
Script Parsing & Compilation	57.37
Parse HTML & CSS	43.02

Show Details

Keep request counts low and transfer sizes small — 28 requests • 3,279 KB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.

Resource Type	Requests	Transfer Size (Bytes)
Total	28	3357486
Script	8	2456289
Stylesheet	3	740832
Font	3	114007
Image	7	28141
Document	2	16647
Other	5	1570
Media	0	0
Third-party	18	260712

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Minimize third-party usage — Third-party code blocked the main thread for 0 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.

Third-Party	Size (Bytes)	Main-Thread Blocking Time (Ms)
SHOW DETAILS	75087	0
SHOW DETAILS	30890	0
SHOW DETAILS	19374	0
SHOW DETAILS	586	0

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Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.

Metrics

Time to Interactive — 4.2 s
The time taken for the page to become fully interactive.

First CPU Idle — 4.1 s
The time taken for the page's main thread to be quiet enough to handle input.

Other

Total Blocking Time — 360 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Opportunities

Eliminate render-blocking resources — Potential savings of 470 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Betbrain.cn should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.

URL	Size (Bytes)	Potential Savings (Ms)
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	737367	1150
https://assets1.betbrain.com/ComponentLoader.js	2513	230
https://script.opentracker.net/?site=betbrain.com	1815	230

Show Details

Remove unused CSS — Potential savings of 705 KB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Betbrain.cn should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.

URL	Size (Bytes)	Potential Savings (Bytes)
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	737367	721510

Show Details

Diagnostics

Avoid enormous network payloads — Total size was 3,199 KB
Large network payloads can cost users money and are linked to long load times.

URL	Size (Bytes)
https://www.betbrain.cn/build/app.js?v=rev_d202004280846	2327957
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	737367
https://script.hotjar.com/modules.d61d1be43f8e88ae5ef9.js	71634
https://www.googletagmanager.com/gtag/js?id=UA-613177-11	30890
https://www.google-analytics.com/analytics.js	18794
https://fonts.gstatic.com/s/roboto/v20/KFOlCnqEu92Fr1MmWUlfBBc4.woff2	16415
https://fonts.gstatic.com/s/roboto/v20/KFOmCnqEu92Fr1Mu4mxK.woff2	16308
https://www.betbrain.cn/	15294
https://www.betbrain.cn/assets/img/loader.gif	12575
https://gfxnew1.betbrain.com/logo-l.png	10353

Show Details

Serve static assets with an efficient cache policy — 5 resources found
Betbrain.cn can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.

URL	Cache TTL (Ms)	Size (Bytes)
https://gfxnew1.betbrain.com/logo-l.png	0	10353
https://gfxnew1.betbrain.com/18.png	0	2622
https://assets1.betbrain.com/ComponentLoader.js	0	2513
https://static.hotjar.com/c/hotjar-532900.js?sv=5	60000	2100
https://www.google-analytics.com/analytics.js	7200000	18794

Show Details

Metrics

First Contentful Paint — 1.6 s
The time taken for the first image or text on the page to be rendered.

First Meaningful Paint — 1.6 s
The time taken for the primary content of the page to be rendered.

Speed Index — 3.4 s
The time taken for the page contents to be visibly populated.

Max Potential First Input Delay — 470 ms
Users could experience a delay when interacting with the page.

Opportunities

Enable text compression — Potential savings of 2,157 KB
Text-based resources should be served with compression, such as gzip, deflate or brotli.

URL	Size (Bytes)	Potential Savings (Bytes)
https://www.betbrain.cn/build/app.js?v=rev_d202004280846	2327617	1786344
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	737058	422356

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Reduce server response times (TTFB) — Root document took 650 ms
Time to First Byte (TTFB) identifies the time at which the server sends a response.

Diagnostics

Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.

URL	Potential Savings (Ms)
https://fonts.gstatic.com/s/roboto/v20/KFOlCnqEu92Fr1MmWUlfBBc4.woff2	4.2169999796897
https://fonts.gstatic.com/s/roboto/v20/KFOmCnqEu92Fr1Mu4mxK.woff2	4.3420000001788

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Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of betbrain.cn. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.

The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.

No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.

`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.

Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.

`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.

`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.

`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.

`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.

Audio and video

`<audio>` elements contain a `<track>` element with `[kind="captions"]`
Betbrain.cn may provide assistance to deaf or hearing-impaired users with captions on audio elements.

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Betbrain.cn may provide assistance to deaf or hearing-impaired users with captions on videos.

`<video>` elements contain a `<track>` element with `[kind="description"]`
Betbrain.cn may provide relevant information that dialogue cannot, by using audio descriptions.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.

`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.

Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.

`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.

Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.

`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>` or `<template>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.

Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.

Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.

Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.

List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.

Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.

`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Best practices

`[id]` attributes on the page are unique
It is advised to keep all id attributes unique in order to prevent instances from being overlooked by screen readers and other assistive technologies.

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.

`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.

`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.

Failing Elements
cookie policy
OK
Application updates won't work with more than five odds pages (tabs) opened wit…

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Names and labels

Document doesn't have a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.

Failing Elements
html

Show Details

Links do not have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

Failing Elements
a
a
a
a

Show Details

Best practices

`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Failing Elements
meta

Show Details

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.

Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.

Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.

The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.

User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.

Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.

Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.

Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.

Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.

Headings don't skip levels
Ensure that headings create an outline for the page and that heading levels are not skipped.

HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that betbrain.cn should incorporate. This includes practices such as protecting pages with HTTPS.

Passing (10)
Failing (4)

Other

Avoids Application Cache
Application cache is deprecated and is no longer recommended.

Uses passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.

Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.

Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.

Name	Version
Lo-Dash	3.10.1

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Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.

Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.

Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.

Other

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.

Insecure URL
http://betbrain.cn/

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Links to cross-origin destinations are unsafe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.

URL	Target	Rel
https://www.facebook.com/BetBrain	_blank	external nofollow
https://www.twitter.com/BetBrain1	_blank	external nofollow

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Includes front-end JavaScript libraries with known security vulnerabilities — 4 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.

Library Version	Vulnerability Count	Highest Severity
SHOW DETAILS	4	High

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Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.

URL	Description
https://www.betbrain.cn/	Access to XMLHttpRequest at 'https://newbbfeapi.betbrain.cn/websocket/934/1f1cffebf8fd486a85aa4287d273efe4_2/xhr_streaming?t=1588252563917' from origin 'https://www.betbrain.cn' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
https://www.betbrain.cn/	Access to XMLHttpRequest at 'https://newbbfeapi.betbrain.cn/websocket/934/1f1cffebf8fd486a85aa4287d273efe4_3/xhr?t=1588252564062' from origin 'https://www.betbrain.cn' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
https://inactive.opentracker.net/collect.jsp?p=1&mid=67.205.137.127:1588252560693&fv=true&ti=&si=betbrain.com&sh=600&sw=800&sc=24&lc=https%3A//www.betbrain.cn/&ref=&t0=1588252560693	Failed to load resource: net::ERR_CONNECTION_FAILED
https://newbbfeapi.betbrain.cn/websocket/934/1f1cffebf8fd486a85aa4287d273efe4_2/xhr_streaming?t=1588252563917	Failed to load resource: the server responded with a status of 403 (Forbidden)
https://newbbfeapi.betbrain.cn/websocket/934/1f1cffebf8fd486a85aa4287d273efe4_2/xhr_streaming?t=1588252563917	Failed to load resource: the server responded with a status of 403 (Forbidden)
https://newbbfeapi.betbrain.cn/websocket/934/1f1cffebf8fd486a85aa4287d273efe4_3/xhr?t=1588252564062	Failed to load resource: the server responded with a status of 403 (Forbidden)
https://newbbfeapi.betbrain.cn/websocket/934/1f1cffebf8fd486a85aa4287d273efe4_3/xhr?t=1588252564062	Failed to load resource: the server responded with a status of 403 (Forbidden)
https://loader.wisepops.com/get-loader.js?v=1&site=JLHLkBS6nY	Failed to load resource: the server responded with a status of 404 (Not Found)
https://www.betbrain.cn/build/app.js?v=rev_d202004280846	WebSocket connection to 'wss://newbbfeapi.betbrain.cn/websocket/934/1f1cffebf8fd486a85aa4287d273efe4_1/websocket' failed: Error in connection establishment: net::ERR_NAME_NOT_RESOLVED

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SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for betbrain.cn. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of betbrain.cn on mobile screens.

Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.

Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.

Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.

robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Links have descriptive text
Make use of descriptive link text to assist search engines in understanding the content.

Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.

Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.

Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.

Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Content Best Practices

Document doesn't have a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.

Failing Elements
html

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Document does not have a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of betbrain.cn. This includes details about web app manifests.

PWA Optimized

Redirects HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.

Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of betbrain.cn on mobile screens.

Contains some content when JavaScript is not available
Apps should display alternative content for when JavaScript is disabled.

Provides a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.

Fast and reliable

Page load is not fast enough on mobile networks — Interactive on simulated mobile network at 22.0 s
Ensure that the page loads fast enough over a cellular network, to ensure good mobile user experience.

Current page does not respond with a 200 when offline
In order for Progressive Web Apps to be made available offline, ensure that the app is using a service worker.

`start_url` does not respond with a 200 when offline
Consider using a service worker for Progressive Web Apps to ensure greater reliability for the user, in the case of poor network conditions.

Installable

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.

Insecure URL
http://betbrain.cn/

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Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.

Web app manifest does not meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
View Data

PWA Optimized

Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data

Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.

Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.

Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.

Avg. (All Categories)

Performance

Accessibility

Best Practices

SEO

Progressive Web App

0–49 (Fail) 50–89 (Average) 90–100 (Pass)

Simulate loading on mobile

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for betbrain.cn. This includes details about optimizing page load times which can result in a better user experience.

Opportunities

Properly size images
Images can slow down the page's load time. Betbrain.cn should consider serving more appropriate-sized images.

Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Betbrain.cn should consider lazy-loading offscreen and hidden images.

Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Betbrain.cn should consider minifying CSS files.

Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Betbrain.cn should consider minifying JS files.

Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.

Serve images in next-gen formats
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.

Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.

Server response times are low (TTFB) — Root document took 310 ms
Time to First Byte (TTFB) identifies the time at which the server sends a response.

Avoid multiple page redirects — Potential savings of 630 ms
Redirects can cause additional delays before the page can begin loading. Betbrain.cn should avoid multiple or unnecessary page redirects.

URL	Time Spent (Ms)
(Start) http://betbrain.cn/	0
https://www.betbrain.cn/	630

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Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Betbrain.cn should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.

Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.

Diagnostics

Avoids an excessive DOM size — 363 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.

Statistic	Element	Value
Total DOM Elements		363
Maximum DOM Depth	SHOW DETAILS	13
Maximum Child Elements	SHOW DETAILS	25

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Avoid chaining critical requests — 9 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Betbrain.cn should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.

Keep request counts low and transfer sizes small — 30 requests • 3,283 KB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.

Resource Type	Requests	Transfer Size (Bytes)
Total	30	3362182
Script	8	2456235
Stylesheet	3	741094
Font	4	117751
Image	6	28114
Document	2	16639
Other	7	2349
Media	0	0
Third-party	20	265446

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Minimize third-party usage — Third-party code blocked the main thread for 170 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.

Third-Party	Size (Bytes)	Main-Thread Blocking Time (Ms)
SHOW DETAILS	75896	105.216
SHOW DETAILS	19320	63.384
SHOW DETAILS	30863	0
SHOW DETAILS	586	0

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Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.

Other

Network Requests
Below is a list of network requests that were made during page load.

URL	Start Time (Ms)	End Time (Ms)	Transfer Size (Bytes)	Resource Size (Bytes)	Status Code	MIME Type	Resource Type
http://betbrain.cn/	0	205.80699999118	165	0	301
https://www.betbrain.cn/	206.37599995825	516.44699997269	15286	65896	200	text/html	Document
https://www.googletagmanager.com/gtag/js?id=UA-613177-11	555.36599998595	583.39399995748	30863	81635	200	application/javascript	Script
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	555.82299997332	1231.5729999682	737367	737058	200	text/css	Stylesheet
https://assets1.betbrain.com/ComponentLoader.js	556.03399995016	1018.0929999915	2513	5279	200	application/javascript	Script
https://script.opentracker.net/?site=betbrain.com	556.33900000248	630.57300000219	1815	3694	200	text/javascript	Script
https://gfxnew1.betbrain.com/logo-l.png	557.56799998926	667.52599994652	10353	10409	200	image/png	Image
https://www.betbrain.cn/assets/img/logo-s.svg	592.06499997526	702.74999999674	2011	1701	200	image/svg+xml	Image
https://gfxnew1.betbrain.com/18.png	669.7029999923	1116.0209999653	2622	2587	200	image/png	Image
https://www.google-analytics.com/analytics.js	704.5189999626	714.57199996803	18767	45229	200	text/javascript	Script
https://www.google-analytics.com/r/collect?v=1&_v=j81&a=1453361968&t=pageview&_s=1&dl=https%3A%2F%2Fwww.betbrain.cn%2F&ul=en-us&de=UTF-8&sd=24-bit&sr=412x660&vp=412x660&je=0&_u=IEBAAUAB~&jid=1577936344&gjid=743980618&cid=552253469.1588252577&tid=UA-613177-11&_gid=1851188082.1588252577&_r=1&gtm=2ou4f0&z=1744046076	750.47299999278	755.35399996443	553	35	200	image/gif	Image
https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,500,500i,700,700i,900	1241.6949999752	1263.6469999561	2198	23178	200	text/css	Stylesheet
https://fonts.googleapis.com/css?family=Roboto+Slab:400,700	1241.8670000043	1253.8179999683	1529	4266	200	text/css	Stylesheet
https://inactive.opentracker.net/collect.jsp?p=1&mid=67.205.137.127:1588252577017&fv=true&ti=&si=betbrain.com&sh=660&sw=412&sc=24&lc=https%3A//www.betbrain.cn/&ref=&t0=1588252577017	1276.9069999922	1355.2759999875	0	0	-1		Image
https://www.betbrain.cn/assets/img/loader.gif	1300.625999982	1426.9579999964	12575	12267	200	image/gif	Image
	1305.1129999803	1357.7240000013	81284	81284	200	application/font-woff	Font
https://fonts.gstatic.com/s/roboto/v20/KFOjCnqEu92Fr1Mu51TzBic6CsTYl4BO.woff2	1309.947999951	1313.9819999924	13260	12688	200	font/woff2	Font
https://fonts.gstatic.com/s/roboto/v20/KFOlCnqEu92Fr1MmWUlfBBc4AMP6lQ.woff2	1311.7339999881	1315.1999999536	11619	11020	200	font/woff2	Font
https://fonts.gstatic.com/s/roboto/v20/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2	1312.8009999637	1316.3579999818	11588	11016	200	font/woff2	Font
https://www.betbrain.cn/build/app.js?v=rev_d202004280846	1362.1679999633	2208.0549999955	2327957	2327617	200	application/javascript	Script
https://static.hotjar.com/c/hotjar-532900.js?sv=5	1377.7249999694	1751.4119999832	2100	3351	200	application/javascript	Script
https://loader.wisepops.com/get-loader.js?v=1&site=JLHLkBS6nY	1377.9069999582	1408.0419999664	586	0	404	text/javascript	Script
https://script.hotjar.com/modules.d61d1be43f8e88ae5ef9.js	1756.1099999584	1819.7289999807	71634	376497	200	application/javascript	Script
https://vars.hotjar.com/box-469cf41adb11dc78be68c1ae7f9457a4.html	1814.6089999937	1838.1389999995	1353	2063	200	text/html	Document
https://in.hotjar.com/api/v2/client/sites/532900/visit-data?sv=5	1911.5649999585	2012.3889999813	322	0	200	text/plain	XHR
https://in.hotjar.com/api/v2/client/sites/532900/visit-data?sv=5	2016.604000004	2146.4879999985	487	217	200	application/json	XHR
https://newbbfeapi.betbrain.cn/httphs?method=get	2805.8849999798	3222.398999962	715	47	200	application/json	Fetch
https://newbbfeapi.betbrain.cn/websocket/info?t=1588252579656	3234.1479999595	3653.537999955	462	78	200	application/json	XHR
https://newbbfeapi.betbrain.cn/websocket/235/f34e61af75844e719052065784577a9e_2/xhr_streaming?t=1588252580107	3684.5999999787	3793.6779999873	99	0	403	text/plain	XHR
https://newbbfeapi.betbrain.cn/websocket/235/f34e61af75844e719052065784577a9e_3/xhr?t=1588252580217	3795.5259999726	3908.9649999514	99	0	403	text/plain	XHR

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Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.

Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.

Tasks
Below is a list of the top-level main thread tasks that executed during page load.

Start Time (Ms)	End Time (Ms)
546.315	26.474
576.74	11.008
615.458	6.61
622.688	12.99
726.464	6.131
742.284	31.28
1258.222	33.075
1294.015	8.931
1303.203	70.697
1387.862	9.169
1401.784	9.094
1829.528	5.099
1855.478	47.721
1903.25	8.997
1924.047	12.881
2234.222	6.099
2348.019	451.541
2805.464	8.98
2814.453	7.722
2822.19	8.039
3247.52	6.174
3676.746	10.584

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Diagnostics
Below is a collection of useful page vitals.
View Data

Metrics
Below is a collection of metrics.
View Data

Diagnostics

Avoid enormous network payloads — Total size was 3,204 KB
Large network payloads can cost users money and are linked to long load times.

URL	Size (Bytes)
https://www.betbrain.cn/build/app.js?v=rev_d202004280846	2327957
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	737367
https://script.hotjar.com/modules.d61d1be43f8e88ae5ef9.js	71634
https://www.googletagmanager.com/gtag/js?id=UA-613177-11	30863
https://www.google-analytics.com/analytics.js	18767
https://www.betbrain.cn/	15286
https://fonts.gstatic.com/s/roboto/v20/KFOjCnqEu92Fr1Mu51TzBic6CsTYl4BO.woff2	13260
https://www.betbrain.cn/assets/img/loader.gif	12575
https://fonts.gstatic.com/s/roboto/v20/KFOlCnqEu92Fr1MmWUlfBBc4AMP6lQ.woff2	11619
https://fonts.gstatic.com/s/roboto/v20/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2	11588

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Serve static assets with an efficient cache policy — 5 resources found
Betbrain.cn can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.

URL	Cache TTL (Ms)	Size (Bytes)
https://gfxnew1.betbrain.com/logo-l.png	0	10353
https://gfxnew1.betbrain.com/18.png	0	2622
https://assets1.betbrain.com/ComponentLoader.js	0	2513
https://static.hotjar.com/c/hotjar-532900.js?sv=5	60000	2100
https://www.google-analytics.com/analytics.js	7200000	18767

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Reduce JavaScript execution time — 2.4 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.

URL	Total CPU Time (Ms)	Script Evaluation (Ms)	Script Parse (Ms)
https://www.betbrain.cn/build/app.js?v=rev_d202004280846	1920.552	1770.688	148.568
Other	1122.648	49.788	9.264
https://script.hotjar.com/modules.d61d1be43f8e88ae5ef9.js	241.8	216.34	25.46
https://www.google-analytics.com/analytics.js	122.684	117.008	5.676
https://www.googletagmanager.com/gtag/js?id=UA-613177-11	85.836	76.1	9.736

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Minimize main-thread work — 3.6 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.

Category	Time Spent (Ms)
Script Evaluation	2311.18
Other	516.668
Style & Layout	341.58
Script Parsing & Compilation	212.74
Parse HTML & CSS	170.892
Rendering	36.136

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Metrics

First Contentful Paint — 6.8 s
The time taken for the first image or text on the page to be rendered.

First Meaningful Paint — 6.8 s
The time taken for the primary content of the page to be rendered.

Speed Index — 7.0 s
The time taken for the page contents to be visibly populated.

Time to Interactive — 22.4 s
The time taken for the page to become fully interactive.

First CPU Idle — 6.8 s
The time taken for the page's main thread to be quiet enough to handle input.

Max Potential First Input Delay — 1,810 ms
Users could experience a delay when interacting with the page.

Other

Estimated Input Latency — 1,060 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive betbrain.cn as laggy when the latency is higher than 0.05 seconds.

Total Blocking Time — 1,540 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

First Contentful Paint (3G) — 15090 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.

Opportunities

Eliminate render-blocking resources — Potential savings of 3,600 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Betbrain.cn should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.

URL	Size (Bytes)	Potential Savings (Ms)
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	737367	5280
https://assets1.betbrain.com/ComponentLoader.js	2513	780
https://script.opentracker.net/?site=betbrain.com	1815	780

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Remove unused CSS — Potential savings of 709 KB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Betbrain.cn should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.

URL	Size (Bytes)	Potential Savings (Bytes)
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	737367	726030

Show Details

Enable text compression — Potential savings of 2,157 KB
Text-based resources should be served with compression, such as gzip, deflate or brotli.

URL	Size (Bytes)	Potential Savings (Bytes)
https://www.betbrain.cn/build/app.js?v=rev_d202004280846	2327617	1786344
https://www.betbrain.cn/build/app.css?v=rev_d202004280846	737058	422356

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Diagnostics

Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.

URL	Potential Savings (Ms)
https://fonts.gstatic.com/s/roboto/v20/KFOjCnqEu92Fr1Mu51TzBic6CsTYl4BO.woff2	4.034000041429
https://fonts.gstatic.com/s/roboto/v20/KFOlCnqEu92Fr1MmWUlfBBc4AMP6lQ.woff2	3.465999965556
https://fonts.gstatic.com/s/roboto/v20/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2	3.5570000181906

Show Details

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of betbrain.cn. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.

The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.

No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.

`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.

Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.

`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.

`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.

`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.

`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.

Audio and video

`<audio>` elements contain a `<track>` element with `[kind="captions"]`
Betbrain.cn may provide assistance to deaf or hearing-impaired users with captions on audio elements.

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Betbrain.cn may provide assistance to deaf or hearing-impaired users with captions on videos.

`<video>` elements contain a `<track>` element with `[kind="description"]`
Betbrain.cn may provide relevant information that dialogue cannot, by using audio descriptions.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.

`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.

Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.

`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.

`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>` or `<template>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.

Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.

Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.

Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.

List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.

Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.

`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Best practices

`[id]` attributes on the page are unique
It is advised to keep all id attributes unique in order to prevent instances from being overlooked by screen readers and other assistive technologies.

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.

`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.

`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.

Failing Elements
cookie policy
OK
Application updates won't work with more than five odds pages (tabs) opened wit…

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Names and labels

Document doesn't have a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.

Failing Elements
html

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Form elements do not have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.

Failing Elements
input

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Links do not have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

Failing Elements

a
a

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Best practices

`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Failing Elements
meta