Practices for ensuring data-oriented markup remains usable, including meaningful element names and text alternatives for embedded media.
Semantic structure using h1–h6 to convey document outline. Avoid skipping levels and use headings to label sections.
Page sections identified by semantic elements or ARIA roles (main, navigation, complementary, banner, contentinfo) for quick navigation.
The sequence in which content is read by assistive tech and reached by focus should match the visual and semantic order.
Content order that preserves meaning and operability when styles change or linearized for assistive technologies.
Using HTML elements for their intended purpose to convey meaning and relationships, forming the foundation of accessibility.
Standards-compliant markup that avoids errors. Validity improves parsing by assistive technologies and user agents.
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