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Screen reader reliability HTML, CSS and ARIA

Last updated: April 7, 2019

Overall reliability of HTML, CSS and ARIA features designed for assistive technology in different screen reader / browser combinations.

The graph only includes results for tests which are expected to work. Expected failures (e.g. missing ALT on an IMG) are not included in the graph.

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.

JAWS IEJAWS 2018.1811.2 with IE1190%
JAWS FirefoxJAWS 2018.1811.2 with FF6078%
NVDA IENVDA 2018.4 with IE1173%
NVDA FirefoxNVDA 2018.4 with FF6084%
VoiceOver MacVoiceOver macOS 10.13 with Safari 12.179%
VoiceOver iOSVoiceOver iOS 11.4 with Safari iOS 11.468%
WindowEyes IEWindowEyes 9.2 with IE1186%
Dolphin IEDolphin SR 15.05 with IE1170%
SaToGo IESaToGo with IE1153%
Average Including older versions 76%

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).