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JH A11y tools

Review web accessibility with zoom, reflow, accessible names, targets, focus and headings in Chrome.

JH A11y tools brings together quick actions for reviewing key behaviours directly in the browser. It makes common issues visible through overlays, filters and list views, without replacing manual audits or professional judgement.

LanguagesSpanish and English

Install in Chrome

In action

How it
works.

JH A11y tools panel with review tools
A flexible panel that brings checks together.
Touch target review with JH A11y tools
Check the actual size of interactive areas.
Heading map for a web page
Review the H1–H6 hierarchy and detect skipped levels.

Main features

Everything essential,
at a glance.

  1. 01

    Accessible names

    Classify the source of names and detect unnamed elements, weak names or duplicates.

  2. 02

    AA and AAA targets

    Measure the actual operable area and distinguish passes, failures, spacing, clipping and overlapping layers.

  3. 03

    Focus order

    Visualise the tab sequence, positive tabindex values and hidden elements during keyboard navigation.

  4. 04

    Heading hierarchy

    Review H1–H6 levels, order, status and document branches in a collapsible hierarchy map.

  5. 05

    Text zoom

    Test text enlargement at 200% using different zoom modes.

  6. 06

    Text spacing

    Apply the spacing defined by WCAG 1.4.12 to check how content adapts.

  7. 07

    Reflow at 400%

    Validate content reflow using browser zoom.

  8. 08

    Mobile and tablet viewports

    Switch the viewport between mobile and tablet sizes to review how the page responds.

Permissions

Technical
transparency.

Page contentAnalyses the DOM locally to display accessible names and test styles.
Zoom and tabsSupports validation of the Reflow criterion using browser zoom.
Local storageKeeps the state of active tools during the session.

Privacy

Your information
stays with you.

This extension is designed to work with minimal data exposure. Review the permission details and specific privacy policy before installing.

Read the privacy policy

Frequently asked questions

Before you
begin.

Does it replace an accessibility audit?

No. JH A11y tools helps inspect specific aspects and reveal potential issues, but its results require manual review and professional judgement. On its own, it does not certify that a page conforms to accessibility standards.

What can I review with it?

It includes checks for accessible names, target size, focus order, heading hierarchy, text zoom, text spacing, reflow at 400% and different viewport sizes.

Does the extension send the content of the pages I analyse?

No. DOM analysis and test styles are applied locally in the browser; content is not transmitted to Complementa or external servers.

Latest update

What’s
new.

View full history
Version
2.27.6
Date
30/08/2026
Highlight
A much clearer heading reviewThe new version turns the heading hierarchy into a compact, actionable map. Review levels, order, status and document branches without losing the context of the page.