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Headings Screen reader compatibility

Accessibility
Nov 26, 2024

Screen reader compatibility for HTML and ARIA headings, showing how failures and techniques work in specific screen reader / browser combinations.

The results include two types of test:

  • Expected to work - these tests show support when accessibility features are used correctly
  • Expected to fail - these tests show what happens when accessibility features are used incorrectly (marked with Expected to Fail)

Reliability by user agent

The solid area in the graph shows percentage of tests that pass in all tested interaction modes. The cross hatched area shows partial passes that only work in some interaction modes.

An example of a partial pass is when form labels are read when tabbing, but ignored in browse mode.

ComboVersionsReliabilityTest Changes
JAWS ChromeJAWS 2024.2409.2 with Chrome 131
JAWS EdgeJAWS 2024.2409.2 with Edge 131
JAWS FirefoxJAWS 2024.2409.2 with FF 128
JAWS IEJAWS 2019.1912.1 with IE11
NVDA ChromeNVDA 2024.4 with Chrome 131
NVDA EdgeNVDA 2024.4 with Edge 131
NVDA FirefoxNVDA 2024.4 with FF 128
NVDA IENVDA 2019.2 with IE11
1 better
VoiceOver MacVoiceOver macOS 14.6 with Safari 17.6
VoiceOver iOSVoiceOver iOS 17.7 with Safari iOS 17.7
WindowEyes IEWindowEyes 9.2 with IE11
1 better
Dolphin IEDolphin SR 15.05 with IE11
SaToGo IESaToGo 3.4.96.0 with IE11
Average Including older versions

The average includes all versions, but some browser/AT combinations have tests for multiple versions (NVDA / JAWS / VoiceOver), while others only have tests for a single version (SaToGo and Dolphin).

Reliability trend

100%80%60%40%20%0%201480%2015100%2016100%2017100%2018100%2019100%2020100%2021100%2022100%2023100%2024100%

Works as expected

These tests use conformant HTML or WCAG sufficient techniques, and work in all tested browser / screen reader combinations.

Screen ReaderNVDAJAWSVoiceOver
BrowserEdgeFFCrEdgeFFCrMaciOS
Should work. Works in 100% Heading is img with altGoodGoodGoodGoodGoodGoodGoodGood

Expected to work

These tests use conformant HTML or WCAG sufficient techniques and might be expected to work in screen readers. This doesn't always happen.

Screen ReaderNVDAJAWSVoiceOver
BrowserEdgeFFCrEdgeFFCrMaciOS
Should work. Fails in 1% - 25% ARIA role=headingGoodGoodGoodGoodGoodGoodGoodGood

Expected to fail

These tests use non-conformant HTML or WCAG failures and are expected to fail in screen readers.

Screen ReaderNVDAJAWSVoiceOver
BrowserEdgeFFCrEdgeFFCrMaciOS
Should fail. Fails in 1% - 25% Empty headingGoodGoodGoodGoodGoodGoodGoodBetter
Should fail. Fails in 76% - 100% Heading is img alt=filenameBadBadBadBadBadBadBadBad
Should fail. Fails in 76% - 100% Heading is img with `alt=BadBadBadBadBadBadBadBad
Should fail. Fails in 76% - 100% Heading is img with no altBadBadBadBadBadBadBadBad
Should fail. Fails in 1% - 25% Heading non-breaking spacesBadBetterBadGoodBetterGoodBetterGood
Should fail. Fails in 76% - 100% Heading only punctuationBadBadBadBadBadBadBadBetter
Should fail. Fails in 1% - 25% Heading only spacesGoodGoodGoodGoodGoodGoodGoodBetter
Should fail. Fails in 76% - 100% Nested ARIA headingsBadBadBadBadBadBadBadBetter
Should fail. Fails in 76% - 100% Nested headingsBadBadBadBadBadBadBadBad

Key

Tests expected to fail (due to authoring errors) are marked with Expected to Fail.

  • Works in all Works in 100% of tested screen readers
  • 75% to 99% Fails in 1% - 25% of tested screen readers
  • 50% to 74% Fails in 26% - 50% of tested screen readers
  • 25% to 49% Fails in 51% - 75% of tested screen readers
  • 0% to 24% Fails in 76% - 100% of tested screen readers
  • Stable Stable - works, or doesn't cause problems, in all versions of a specific combination of screen reader and browser
  • Better Better - works, or doesn't cause problems, in the most recent version of a specific combination of screen reader and browser (improvement)
  • Worse Worse - causes problems in the most recent version of a specific combination of screen reader and browser, but used to work in older versions (regression)
  • Broken Broken - causes problems in all versions of a specific combination of screen reader and browser

Test notes

All tests were carried out with screen reader factory settings. JAWS in particular has a wide variety of settings controlling exactly what gets spoken.

Screen readers allow users to interact in different modes, and can produce very different results in each mode. The modes used in these tests are:

  • Reading Content read using the “read next” command in a screen reader
  • Tabbing Content read using the “tab” key in a screen reader
  • Heading Content read using the “next heading” key in a screen reader
  • Touch Content read when touching an area of screen on a mobile device

In the “What the user hears” column:

  • Commas represent short pauses in screen reader voicing
  • Full Stops represent places where voicing stops, and the “read next” or “tab” or “next heading” command is pressed again
  • Ellipsis … represent a long pause in voicing
  • (Brackets) represent voicing that requires a keystroke to hear