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Accessibility

· 13 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.
SCORE
45
GRADE
F
FIX
7
REVIEW
5
PASS
1
INFO
0
Checks
13
1 PASS 5 REVIEW 7 FIX
D
Landmark Structure
Action
24 landmarks
FIX
24 landmarks
Critical::
No <main> landmark found
Screen reader users cannot quickly navigate to the primary content. Wrap your main content in <main>.
Info::
2 <nav> landmark(s) found
Warning::
2 of 2 <nav> elements are unlabeled
Multiple navigations need aria-label to distinguish them for screen readers.
Warning::
Skip navigation link is missing (WCAG 2.4.1)
Add a skip link as the first focusable element so keyboard users can bypass repeated navigation.
Page Structure — as a screen reader sees it
BANNER header NAV MAIN (missing!) CONTENTINFO footer

Screen reader users cannot quickly navigate to the primary content. Wrap your main content in <main>.

Why this matters

Without a <main> landmark, screen-reader users can't skip past the navigation to the page content — every page starts with re-reading the menu.

Learn more ▾

The <main> element marks the page's primary content area. Assistive tech offers a 'jump to main' shortcut — but only if <main> exists. Without it, every page navigation forces re-reading the header. Wrap your primary content in a single <main>.

Source: WAI-ARIA / WCAG 2.4.1

Multiple navigations need aria-label to distinguish them for screen readers.

Why this matters

Some <nav> elements lack aria-label — screen-reader users hear 'navigation' multiple times with no way to distinguish them.

Learn more ▾

When a page has multiple <nav> regions (primary, footer, breadcrumb), each needs aria-label or aria-labelledby. AT users navigate by landmark; identical 'navigation' announcements force them to enter each one to discover purpose.

Source: WAI-ARIA Authoring Practices

Add a skip link as the first focusable element so keyboard users can bypass repeated navigation.

Why this matters

Without a skip-nav link, keyboard users tab through every nav item before reaching content — every page, every visit.

Learn more ▾

WCAG 2.4.1 (Bypass Blocks) requires a mechanism to skip past repeated content. The standard implementation is a 'Skip to main content' link that's the first focusable element, visually hidden until focused. Three lines of HTML + four of CSS.

Source: WCAG 2.1 SC 2.4.1

F
Alt Text Quality
Action
20 of 50 images have issues
FIX
20 of 50 images have issues
Critical::
20 image(s) missing alt attribute
Images without alt text are invisible to screen readers.
Critical::
18 image-in-link without alt text
An image inside a link with no alt creates an empty link.
Info::
30 image(s) with good alt text
50 images 30 good alt text 20 missing
IssueCount
missing20 image(s)

Images without alt text are invisible to screen readers.

Why this matters

Each image without alt text is a WCAG 1.1.1 failure — invisible to screen-reader users, lost from Google Image Search.

Learn more ▾

WCAG 2.1 Level A requires text alternatives for non-decorative images. Empty alt='' is fine for decorative; meaningful images need descriptive text. Common fixes: CMS audit + bulk add, build-time linter (alt-text-required ESLint rule), CI gate on Lighthouse a11y score.

Source: WCAG 2.1 SC 1.1.1 / WebAIM Million Report

An image inside a link with no alt creates an empty link.

Why this matters

Image-only links with no alt create empty links — screen-reader users hear 'link' with no destination context.

Learn more ▾

An <a><img></a> with no img alt is the worst-case for accessibility: AT announces the link but can't describe where it goes. Either add alt to the image OR add aria-label to the link.

Source: WCAG 2.1 SC 2.4.4

D
Web Manifest
Action
Not found
FIX
Not found
Info::
No web manifest found
No manifest at standard paths (/manifest.json, /site.webmanifest). A manifest is optional but enables PWA features like home screen installation and standalone display.

No web manifest found.

D
Dark Mode Support
Action
No dark mode signals
FIX
No dark mode signals
Info::
No dark mode signals detected
Consider adding CSS with @media (prefers-color-scheme: dark) and <meta name='color-scheme' content='light dark'>.
Info::
Detection limited to meta tags and inline styles
External CSS files may contain prefers-color-scheme rules not visible to this scan.
Dark ModeNo Dark Mode Detected
color-scheme meta Not set ✗Dark theme-color Not set ✗CSS indicators Not detected ✗

Detection limited to meta tags and inline styles.

D
Print Stylesheet
Action
No print styles
FIX
No print styles
Info::
No print-specific styles detected
When users print this page, they get the screen layout including navigation and non-essential elements. Add @media print rules to hide navigation and optimize layout for paper.
Print Stylesheet No Print Styles
Print stylesheet Not found ✗Inline @media print Not detected ✗
F
Navigation UX
Action
No navigation patterns
FIX
No navigation patterns
Info::
2 navigation landmark(s) detected
Info::
No breadcrumbs, search, or skip link detected
These navigation aids help users orient themselves and find content efficiently, especially on large sites.
Breadcrumbs
Search
Skip Link
Labeled Navigation 2 <nav> element(s)
Back to Top
Hamburger Menu
Sticky Navigation Cannot reliably detect (CSS-based)
1 of 6 testable patterns navigation patterns detected. Limited navigation support. Consider adding breadcrumbs, search, and skip link.
B
Heading Hierarchy
6 headings
REVIEW
6 headings
Critical::
No H1 heading found
Every page should have one H1 that describes the page content.
  • H4 48小时阅读排行
  • H4 10天推荐排行
  • H4 15天热门博文
  • H4 编辑推荐
  • H4 热门新闻
  • H4 推荐新闻

Every page should have one H1 that describes the page content.

Why this matters

No H1 means screen-reader users can't identify the page's primary topic, and Google's content-extraction degrades.

Learn more ▾

The H1 is the document title for assistive tech and a strong signal to search engines about page topic. Pages without one force screen readers to fall back to the <title> attribute or page chrome. Add a single H1 that names the page's primary subject.

Source: WCAG 2.4.6 / Google Search Central

B
Form Accessibility
3 of 3 controls have issues
REVIEW
3 of 3 controls have issues
Warning::
3 control(s) rely on placeholder only
Placeholder text disappears on focus and is not a reliable label.
Got: <input type="search" name="w" id="zzk_search_input">; <input type="text" name="w" id="zzk_search_input">; <input type="search" name="w" id="zzk_search_input_mobile">
3 controls
0 labeled
3 placeholder only
0 unlabeled
ControlTypeLabelMethod
#zzk_search_inputsearch(代码改变世界)placeholder only
#zzk_search_inputtext(代码改变世界)placeholder only
#zzk_search_input_mobilesearch(搜索)placeholder only

Placeholder text disappears on focus and is not a reliable label.

<input type="search" name="w" id="zzk_search_input">; <input type="text" name="w" id="zzk_search_input">; <input type="search" name="w" id="zzk_search_input_mobile">

Why this matters

Placeholder-only labels disappear when the user starts typing — they must remember what the field was for.

Learn more ▾

Placeholders are NOT labels. They vanish on input, fail color contrast checks (most are gray), and don't satisfy WCAG SC 3.3.2. Always use a real <label> alongside (or aria-labelledby).

Source: WCAG 2.1 SC 3.3.2 / Nielsen Norman

C
404 Error Page
Action
HTTP 404, custom page
REVIEW
HTTP 404, custom page
Info::
Correct 404 status code returned
Got: HTTP 404
Info::
Custom styled 404 page
404 Page Quality ✓ Custom 404 Page
Status Code HTTP 404 ✓Page Title 404 页面不存在 - 博客园 ✓Custom Styling ✓Navigation ✗Homepage Link ✗Search Form ✗
C
Favicon & Branding
Action
4 icon(s) detected
REVIEW
4 icon(s) detected
Info::
favicon.ico present at site root
Info::
HTML icon links detected
Info::
Apple touch icon present
Info::
SVG favicon detected — scales perfectly to any size
✓ favicon.ico Present
✓ PNG Icons Present
✓ Apple Touch Present
✓ SVG Favicon Present
✗ Manifest Icons Missing
✗ Multiple Sizes Missing
C
Lighthouse Accessibility Audits
Action
Score 72/100 — 6 failing, 16 passed
REVIEW
72

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
分类 ul.sidenav > li#sidenav_category > a > span
精华 ul.sidenav > li#sidenav_pick > a > span
订阅 ul.sidenav > li#sidenav_subscription > a > span
关注 ul.sidenav > li#sidenav_following > a > span
我评 ul.sidenav > li#sidenav_commented > a > span
我赞 ul.sidenav > li#sidenav_digged > a > span
足迹 ul.sidenav > li#sidenav_history > a > span
··· div#pager_bottom > div#paging_block > div.pager > span.ellipsis
100 div#pager_bottom > div#paging_block > div.pager > a.p_100
48小时阅读排行 div#side_right > div.card > h4.card-title > a
10天推荐排行 div#side_right > div.card > h4.card-title > a
15天热门博文 div#side_right > div.card > h4.card-title > a
编辑推荐 div#side_right > div.card > h4.card-title > a
热门新闻 div#side_right > div.card > h4.card-title > a
推荐新闻 div#side_right > div.card > h4.card-title > a
战略合作：Chat2DB凌霞软件 body > div#wrapper > footer#footer > div.ally-link
Chat2DB div#wrapper > footer#footer > div.ally-link > a
凌霞软件 div#wrapper > footer#footer > div.ally-link > a
Powered by .NET 10.0 on Kubernetes div#wrapper > footer#footer > div#footer_bottom > div.poweredby
关于博客园 footer#footer > div#footer_bottom > div.about > a
联系我们 footer#footer > div#footer_bottom > div.about > a
商务合作 footer#footer > div#footer_bottom > div.about > a
企业博客 footer#footer > div#footer_bottom > div.about > a
企业发布 footer#footer > div#footer_bottom > div.about > a
Copyright © 2004-2026 博客园 版权所有 footer#footer > div#footer_bottom > div.about > span
浙公网安备 33010602011771号 div#footer_bottom > div.beian > a.gongan > span
浙ICP备2021040463号-3 footer#footer > div#footer_bottom > div.beian > a
违法和不良信息举报中心 footer#footer > div#footer_bottom > div.report-contact > a
举报邮箱：contact@cnblogs.com footer#footer > div#footer_bottom > div.report-contact > span
网站举报中心 footer#footer > div#footer_bottom > div.report-contact > a

These are opportunities to improve the legibility of your content.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
ul.navbar-list > li.dropdown > div.dropdown-button > img ul.navbar-list > li.dropdown > div.dropdown-button > img
div#side_right > div#cnblogs_b1 > a > img div#side_right > div#cnblogs_b1 > a > img
div#side_right > div#cnblogs_b2 > a > img div#side_right > div#cnblogs_b2 > a > img
div#side_right > div#cnblogs_b3 > a > img div#side_right > div#cnblogs_b3 > a > img
div#side_right > div#cnblogs_b4 > a > img div#side_right > div#cnblogs_b4 > a > img
div#footer_bottom > div.beian > a.gongan > img div#footer_bottom > div.beian > a.gongan > img

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > div#wrapper > a body > div#wrapper > a
div#main > div#side_right > div#cnblogs_b1 > a div#main > div#side_right > div#cnblogs_b1 > a
div#main > div#side_right > div#cnblogs_b2 > a div#main > div#side_right > div#cnblogs_b2 > a
div#main > div#side_right > div#cnblogs_b3 > a div#main > div#side_right > div#cnblogs_b3 > a
div#main > div#side_right > div#cnblogs_b4 > a div#main > div#side_right > div#cnblogs_b4 > a

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Navigation

A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the `tabindex` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
ul.navbar-list > li > form#zzk_search_mobile > input#zzk_search_input_mobile ul.navbar-list > li > form#zzk_search_mobile > input#zzk_search_input_mobile

These are opportunities to improve keyboard navigation in your application.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
搜索 ul.navbar-list > li > form#zzk_search_mobile > button#zzk_search_button_mobile
» div.card > ul > li > a.right_more
» div.card > ul > li > a.right_more
» div.card > ul > li > a.right_more

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●Buttons have an accessible name
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●Heading elements appear in a sequentially-descending order
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`[aria-*]` attributes match their roles
○`button`, `link`, and `menuitem` elements have accessible names
○ARIA attributes are used as specified for the element's role
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○`[aria-hidden="true"]` elements do not contain focusable descendents
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements use only permitted ARIA attributes
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○`[aria-*]` attributes have valid values
○`[aria-*]` attributes are valid and not misspelled
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Image elements do not have `[alt]` attributes that are redundant text.
○Elements with visible text labels have matching accessible names.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
A+
Color Contrast (Screenshot)
20 text elements analyzed, 0 fail WCAG AA
PASS

Analyzes text contrast against the actual rendered page, including background images, gradients, and overlays that CSS-based tools cannot detect.

20 pass
Show all checked elements (20)
ElementRatioRequiredFGBGResult
title 博客园 - 开发…21.00:14.5:1
#000000
#FFFFFF
Pass
a 会员20.65:14.5:1
#000000
#FDFDFD
Pass
a 周边19.95:14.5:1
#000000
#F9F9F9
Pass
a 新闻21.00:14.5:1
#000000
#FFFFFF
Pass
a 博问21.00:14.5:1
#000000
#FFFFFF
Pass
a 闪存21.00:14.5:1
#000000
#FFFFFF
Pass
a 班级21.00:14.5:1
#000000
#FFFFFF
Pass
a 赞助商21.00:14.5:1
#000000
#FFFFFF
Pass
a HarmonyOS21.00:14.5:1
#000000
#FFFFFF
Pass
a YouClaw21.00:14.5:1
#000000
#FFFFFF
Pass
a 怀旧21.00:14.5:1
#000000
#FFFFFF
Pass
a 园子21.00:14.5:1
#000000
#FFFFFF
Pass
a 收藏21.00:14.5:1
#000000
#FFFFFF
Pass
span 所有博客21.00:14.5:1
#000000
#FFFFFF
Pass
span 我的博客21.00:14.5:1
#000000
#FFFFFF
Pass
a 我的博客21.00:14.5:1
#000000
#FFFFFF
Pass
a 我的园子21.00:14.5:1
#000000
#FFFFFF
Pass
a 账号设置21.00:14.5:1
#000000
#FFFFFF
Pass
a 会员中心21.00:14.5:1
#000000
#FFFFFF
Pass
a 简洁模式21.00:14.5:1
#000000
#FFFFFF
Pass

Methodology: The top 20 text elements by font size were checked. Background color was sampled from the desktop screenshot using a 5-point pattern. WCAG 2.1 AA requires 4.5:1 for normal text and 3:1 for large text.

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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