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Starred by 3 users
Status: Fixed
Closed: Dec 2015
EstimatedDays: ----
NextAction: ----
OS: All
Pri: 1
Type: Bug

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touch-action zoom state shouldn't reset at scrollers
Project Member Reported by, Sep 8 2015 Back to list
Test page:

On Edge / IE: double-tapping on the scroller does not zoom, and taps are registered immediately.
In Chrome, double-tapping the scroller does zoom.

This means the simple guidance "use 'touch-action: manipulation' to disable the click delay" isn't actually sufficient.

I believe blink matches the spec, but we should change the spec and blink to match the Edge behavior (will start a thread on public-pointer-events).

In particular, we probably want to keep walking up the tree beyond scrollers to consider just the zoom-related parts of touch-action.  Let's wait to see what exact wording the PEWG agrees on for the spec though.

pointer events spec issue:

Note that I marked this pri-1 as I believe this property is important for good click-delay avoidance (which is a major problem on the web).
Comment 2 by, Oct 22 2015
I can take this.
Comment 3 by, Oct 22 2015
Status: Started
Comment 4 by, Oct 28 2015
Labels: -M-47 M-48
Iframe-based test case:

Project Member Comment 6 by, Dec 4 2015
The following revision refers to this bug:

commit 41596bf935a7e28617a668f90f53590e357bc50a
Author: rbyers <>
Date: Fri Dec 04 22:39:16 2015

Don't reset touch-action zoom state at scrollers

This ensures that when a page disables double-tap zoom (eg. via
touch-action: manipulation) and hence the click delay, it stays
disabled even when tapping inside a scroller or iframe.

See for details.

Also removes 'toCoreFrame' declaration which has no implementation
anywhere.  I needed this from my test but discovered the common
pattern was to just invoke the toImplBase method directly.

BUG= 529295 

Review URL:

Cr-Commit-Position: refs/heads/master@{#363310}


Status: Fixed
Labels: -M-48 M-49
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