1672243 - VoiceOver lags when navigating footer links in facebook login page

Status: VERIFIED FIXED

(Core :: Disability Access APIs, defect, P1)

Description

[Eitan Isaacson [:eeejay]]

STR

1. Navigate down to footer links in facebook login page, either the locale list or the longer link list ("Sign Up", "Log In", "Messenger", etc.)

Expected

Pressing VO Next/Prev should be instant.

Actual

There is a noticeable lag. The measured response time is about double what I observed in Safari.

Notes

I noticed with a tooled version of webkit, when you press VO Next from "Italiano" to "Deutsch" you get 1123 attribute retrievals with the majority being AXParent and AXRole with 826 and with 171 calls respectively.

In contrast, Firefox with the same VO step receives 3367 calls with AXParent being retrieved 962 times, AXSubrole 948 times, AXRole 580 times, and AXChildren 243 times.

Solution

After adding AXIndexForChildUIElement and AXTopLevelUIElement Firefox's call count is reduced to 940, and the measured response time is halved.

Comment 1

[Eitan Isaacson [:eeejay]]

Attachment: Bug 1672243 - Introduce AXIndexForChildUIElement and implement AXTopLevelUIElement. r?morgan!

AXTopLevelUIElement is not really testable because it doesn't give a useful result in
headless mode. Since it is a clone of AXWindow, this shouldn't be much of an issue.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/98577a77c663
Introduce AXIndexForChildUIElement and implement AXTopLevelUIElement. r=MarcoZ

Comment 3

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/98577a77c663

Comment 4

[Cristian Fogel [:cfogel]]

Confirmed a good delay on 83.0, verified with 84.0b2 on macOS 10.15.