Blog | UsableNet

Accessibility First: WCAG Makes Your Content Easier for People—and for AI to Understand

Written by Jason Taylor, Chief Innovation Strategist | Sep 25, 2025 7:05:01 PM

AI answers are increasingly present across search experiences, but there is no secret tag that guarantees visibility. What works for people also works for machines: content that is clear, structured, and text‑first. That is precisely what the Web Content Accessibility Guidelines (WCAG) require.

In this post, I keep the focus on accessibility. Core WCAG practices—headings and landmarks, descriptive links, alt text, captions, transcripts, labeled forms, and clean HTML—enhance the usability of your pages with assistive technology and facilitate parsing and citation by AI systems. The goal is not a gimmick.

The goal is to provide better experiences, fewer barriers, and content that can be understood and reused in various contexts, including AI assistants and modern search.

Why accessibility helps people and machines

Accessibility and machine understanding overlap more than most teams realize.

Where they align

  • Structure = chunkable content. Logical headings (H1–H4) and semantic regions (e.g., <main>, <nav>, <footer>) facilitate screen reader navigation and enable retrieval systems to identify self-contained sections.

  • Text alternatives expose meaning. Alt text, captions, and full transcripts turn visuals and audio into quotable text.

  • Clear copy reduces ambiguity. Specific link and button names (“Download the ADA Title II checklist”) make intent obvious for people and improve out‑of‑context comprehension for AI.

  • Clean HTML and reliable rendering. Valid HTML and server-rendered or pre-rendered content ensure more consistent availability to assistive technology and crawlers.

  • Tables that keep relationships. Proper <th scope> preserves header–cell meaning for summaries and conversions.

Where they differ

  • People handle state; models mostly read text. Screen reader users rely on the accessibility tree and keyboard interaction to open menus, activate controls, complete forms, and follow live updates. LLMs typically ingest the HTML and text and may not execute complex client‑side interactions.

  • ARIA is essential for users; models weigh visible text. Roles, names, and states drive usable interactions; models lean on visible hierarchy and copy.

Bottom line: Designing for WCAG enhances experiences for people and increases the likelihood that AI systems accurately interpret your content. LLMs don’t replace accessibility—they benefit from it.

Core WCAG wins you can ship now

  1. Headings & landmarks (1.3.1): Use one <h1> per page that states the topic plainly. Organize content with logical <h2–h4> so each section reads as a self‑contained passage. Add semantic landmarks (<header>, <main>, <nav>, <aside>, <footer>).

  2. Descriptive links (2.4.4): Replace “Learn more” and “Click here” with anchors that carry meaning, such as “Download the ADA Title II checklist.”

  3. Media alternatives (1.1.1, 1.2.x): Provide meaningful alt text for informative images, captions for videos, and complete transcripts for audiovisual content.

  4. Tables (1.3.1): Use <th scope> for data tables; avoid layout tables.

  5. Forms (3.3.x): Associate <label for> every field; provide clear error help with aria-described.

  6. Language & readability (3.1.x):
    • Set the document lang,
    • expand acronyms on first use
    •  keep sentences concise.
    •  
  7. Rendering & crawability
  • Ensure key copy is server‑rendered, statically rendered, or hydrated predictably so it’s indexable and visible to both audiences.

  • Verify sitemaps and canonicals are accurate and policy pages remain public per your governance.

Will more screen reader users rely on AI when sites are hard to use?

Some will use AI tools to locate or summarize information when a site is difficult to navigate. That does not reduce the need for accessibility. If headings, labels, or transcripts are missing, models have less reliable text to quote—and users still face barriers at conversion points.

My stance: Accessibility is the root fix. WCAG improves screen reader experiences and reduces ambiguity for AI systems, increasing eligibility for modern discovery while protecting compliance and conversions.

30‑day “LLM‑ready accessibility” checklist

  1. Audit H1/H2 on the top 25 pages; fix duplicates and gaps.
  2. Convert vague anchors → descriptive links on primary journeys.
  3. Add captions + transcripts for top videos and webinars.
  4. Add <th scope> to data tables; remove layout tables.
  5. Confirm lang on all templates; simplify reading level where possible.
  6. Verify sitemaps + canonicals and that critical copy is server‑rendered.
  7. Allow reputable crawlers per your policy. Keep policy pages public.

Proof in practice 

Teams that add transcripts, fix headings, and clarify link text report smoother screen reader flows, richer snippets in search, and fewer support escalations. The same changes make content easier to quote in internal knowledge tools and AI assistants.

Keep Learning

TL;DR

AI answers are everywhere, but there’s no hidden tag to guarantee visibility. What works for people also works for machines: content that is clear, structured, and text‑first. That’s exactly what WCAG requires. Core WCAG practices make pages easier to use with assistive technology and easier for AI systems to parse and cite.

Goal: Better experiences, fewer barriers, and content that can be understood and reused across contexts—screen readers, search, and AI assistants.

Want to see these fixes on your site? Book a quick demo.