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WCAG Level A Checks

All 22 Level A accessibility checks included in the free version.

Overview

The plugin includes 22 automated WCAG 2.2 Level A checks. These cover the minimum accessibility requirements that all websites should meet. Every check runs automatically when you scan a page.

Image Checks

Missing Alt Text

Detects <img> elements without an alt attribute. Every image must have alt text describing its content, or an empty alt="" for purely decorative images.

WCAG: 1.1.1 Non-text Content

Empty Alt on Informative Images

Finds images that have alt="" but appear to be informative (not decorative). Images with links, buttons, or meaningful context should have descriptive alt text.

WCAG: 1.1.1 Non-text Content

Form Checks

Missing Form Labels

Detects form inputs (<input>, <select>, <textarea>) without an associated <label> element or aria-label attribute. Every form field needs a visible label.

WCAG: 1.3.1 Info and Relationships, 4.1.2 Name, Role, Value

Finds <a> elements with no text content, no aria-label, and no meaningful child elements. Links must have accessible text so screen reader users know where they lead.

WCAG: 2.4.4 Link Purpose, 4.1.2 Name, Role, Value

Empty Buttons

Detects <button> elements with no text content or accessible label. Buttons must communicate their action.

WCAG: 4.1.2 Name, Role, Value

Skip Navigation

Checks whether the page has a skip navigation link that lets keyboard users jump past repeated navigation to the main content.

WCAG: 2.4.1 Bypass Blocks

Warns when links use target="_blank" without indicating they’ll open a new window. Users should be informed before being taken to a new tab.

WCAG: 3.2.5 Change on Request

Tabindex

Flags elements with tabindex values greater than 0, which disrupts the natural tab order and creates a confusing keyboard navigation experience.

WCAG: 2.4.3 Focus Order

Structure Checks

Heading Structure

Verifies that headings follow a logical hierarchy (h1 → h2 → h3) without skipping levels. Skipped heading levels confuse screen reader navigation.

WCAG: 1.3.1 Info and Relationships

Page Title

Checks that the page has a non-empty <title> element. Page titles are the first thing screen readers announce and appear in browser tabs and search results.

WCAG: 2.4.2 Page Titled

Title Redundant

Detects elements where the title attribute duplicates existing text content, creating redundant announcements for screen reader users.

WCAG: 4.1.2 Name, Role, Value

Document Language

Checks that the <html> element has a valid lang attribute. Screen readers use this to determine the correct pronunciation language.

WCAG: 3.1.1 Language of Page

Landmarks

Verifies the page uses landmark regions (<main>, <nav>, <header>, <footer>) to help assistive technology users navigate the page structure.

WCAG: 1.3.1 Info and Relationships

Duplicate IDs

Finds elements with duplicate id attributes. Duplicate IDs break label associations, ARIA references, and fragment links.

WCAG: 4.1.1 Parsing

ARIA Checks

Invalid ARIA Roles

Detects elements with ARIA roles that are not part of the WAI-ARIA specification. Invalid roles are ignored by assistive technology.

WCAG: 4.1.2 Name, Role, Value

Broken ARIA References

Finds ARIA attributes (aria-labelledby, aria-describedby, aria-controls, etc.) that reference IDs that don’t exist on the page.

WCAG: 1.3.1 Info and Relationships

Visual Checks

Color Contrast

Checks that text has sufficient contrast against its background. Normal text requires a ratio of at least 4.5:1.

WCAG: 1.4.3 Contrast (Minimum)

Color Contrast (Large Text)

Checks contrast for large text (18pt+ or 14pt+ bold), which has a lower requirement of 3:1.

WCAG: 1.4.3 Contrast (Minimum)

Media Checks

Auto-playing Media

Detects <video> and <audio> elements with autoplay that play for more than 3 seconds. Auto-playing media can be disorienting and must have controls to pause or stop.

WCAG: 1.4.2 Audio Control

Table Checks

Missing Table Headers

Checks that data tables have header cells (<th>) to identify rows and columns. Tables without headers are difficult to understand with screen readers.

WCAG: 1.3.1 Info and Relationships

Empty Table Headers

Finds <th> elements that have no text content. Empty headers provide no information to screen reader users.

WCAG: 1.3.1 Info and Relationships

iFrame Title

Checks that <iframe> elements have a title attribute describing their content. Screen readers use this title to identify the iframe.

WCAG: 4.1.2 Name, Role, Value

Disabling Checks

If a check doesn’t apply to your site, you can skip it:

  1. Go to Accessibility → Settings
  2. Under Checks, uncheck any checks you want to skip
  3. Save settings

Skipped checks won’t affect your accessibility score.

Next Steps