Use when reviewing image assets, markup, and CDN or build transforms related to Provide meaningful alt text for images. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
インストールする前に、エージェントに与えられる指示の中身を確認できます。
Approximately 2.2 billion people worldwide have vision impairment. Screen readers read the alt attribute aloud—without meaningful alt text, users who are blind receive no information about image content. Missing alt text also fails WCAG 2.1 Success Criterion 1.1.1, which is a Level A (minimum) requirement. Search engines also rely on alt text to index image content.
<img> must have an alt attribute—omitting it entirely violates WCAG 2.1 SC 1.1.1alt="" so screen readers ignore themScan all <img> elements in the codebase. Verify: 1) Every <img> has an alt attribute (missing alt is an error). 2) Decorative images use alt="". 3) Informative images have descriptive text that conveys the image's meaning—not just its file name. 4) Images that are links describe the destination. 5) Images of text reproduce the text in alt. Flag any <img> without alt, with alt matching the filename (e.g., alt="photo1.jpg"), or with generic values like alt="image" or alt="photo".
For each image missing or with poor alt text: 1) Informative images—describe what the image conveys, not just what it shows (e.g., alt="Bar chart showing 40% increase in sales Q3 2024" not alt="chart"). 2) Decorative images—add alt="" so screen readers skip them. 3) Linked images—describe the link destination (e.g., alt="Visit our Twitter profile"). 4) Images of text—copy the text verbatim into alt. 5) Complex images (charts, infographics)—provide a short alt plus a longer description via aria-describedby or a visible caption.
Explain WCAG 2.1 Success Criterion 1.1.1 Non-text Content: every image must have a text alternative. Screen readers announce the alt attribute aloud—without it, users who are blind or have low vision cannot understand the page. Bad alt text (like alt="image") is no better than no alt text. Decorative images must use alt="" explicitly so screen readers skip them entirely—omitting alt causes some screen readers to announce the filename.
Review image assets, markup, and delivery configuration related to Provide meaningful alt text for images. Flag exact files or components where format choice, sizing, or loading behavior violates the rule, and describe how to confirm the fix in DevTools.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/images/alt-text
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概要と使いどころ
Use when reviewing templates, rendered HTML, or shared components related to Create a custom 404 error page. Validate the final browser-facing markup, not just the source framework abstraction.
日本語の概要は準備中です。原文の説明を表示しています。
Use when auditing metadata, crawlability, structured data, or indexability related to Create a dedicated About page. Verify the rendered HTML and HTTP response rather than relying only on source files.
日本語の概要は準備中です。原文の説明を表示しています。
Use when reviewing component libraries, page flows, or CI pipelines that need repeatable accessibility checks. Automated testing is strongest at catching structural and attribute-level issues; it does not replace keyboard, screen reader, and manual UX testing.
日本語の概要は準備中です。原文の説明を表示しています。
Use when reviewing sign-in, sign-up, MFA, CAPTCHA, recovery, and re-auth flows. Evaluate the full authentication path, including error handling and backup methods, not just the primary login form.
日本語の概要は準備中です。原文の説明を表示しています。
Use when reviewing templates, rendered HTML, or shared components related to Make notifications accessible. Validate the final browser-facing markup, not just the source framework abstraction.
日本語の概要は準備中です。原文の説明を表示しています。
Use when reviewing rendered HTML, interactive components, or design-system patterns related to Use semantic table markup for screen readers. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.
日本語の概要は準備中です。原文の説明を表示しています。