HTML & CSS · page 6

List linked stylesheets, media attributes, and stylesheet types.

Review alternate stylesheet links and their titles.

List iframe sources, dimensions, titles, and loading attributes.

Find embedded frames without descriptive titles.

Identify embedded content lacking helpful fallback messaging.

Review embed sources, types, and declared dimensions.

Check video sources, controls, and supported attributes.

Check audio sources, controls, and accessibility considerations.

Check poster images and video fallback behavior.

Find canvas elements lacking meaningful fallback content.

Validate basic MathML structure within HTML documents.

Catalog video, audio, canvas, SVG, iframe, and other embedded elements.

Review machine-readable data values and their displayed labels.

Check editable regions, labels, and nested editing boundaries.

Locate inline event handlers for security and maintainability review.

Check markup attributes against a configurable allowlist.

Validate component classes and required structural elements against design-system rules.

Review HTML email markup for commonly unsupported layout and CSS patterns.

Check email layout tables and associated presentation attributes.

Audit links and tracking parameters in email HTML.

Combine syntax, accessibility, metadata, security, and performance checks into a reusable validation workflow.

Generate responsive utility combinations for screen breakpoints.

Identify malformed selectors, declarations, and missing braces.

Find selectors that do not match elements in supplied HTML.