Bug 150469
| Summary: | remove 350ms touch > mouse events delay for width=device-width viewport | ||
|---|---|---|---|
| Product: | WebKit | Reporter: | Patrick H. Lauke <redux> |
| Component: | UI Events | Assignee: | Nobody <webkit-unassigned> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | Normal | CC: | dpcalhoun, irae, m.goleb+bugzilla, nekr.fabula, rbyers, webkit, wenson_hsieh |
| Priority: | P2 | ||
| Version: | WebKit Nightly Build | ||
| Hardware: | iPhone / iPad | ||
| OS: | Unspecified | ||
Patrick H. Lauke
(opening this as a separate issue from https://bugs.webkit.org/show_bug.cgi?id=122212)
Chrome [1], Firefox and MS Edge currently remove the 300-350ms delay between touchend and the mouse compatibility events (see [2]) for "mobile optimized" pages that have a viewport of width=device-width.
Pages are still zoomable using pinch-to-zoom, but not double-tap-to-zoom. Supporting this in iOS would obviate the need for mobile sites to use tricks such as fastclick.js
Although a more declarative method will now be available with touch-action:manipulation [3], it may still be worth considering this for compatibility with the other major browsers (and the fact that it's arguably the path of least resistance for developers: support for this would mean that sites which currently use width=device-width and fastclick.js can simply remove the latter, vs removing fastclick AND explicitly adding touch-action:manipulation).
[1] https://developers.google.com/web/updates/2013/12/300ms-tap-delay-gone-away?hl=en
[2] http://patrickhlauke.github.io/touch/tests/results/#suppressing-300ms-delay
[3] https://bugs.webkit.org/show_bug.cgi?id=149854
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| Add attachment proposed patch, testcase, etc. |
Patrick H. Lauke
Copying over a useful comment from rbyers from https://bugs.webkit.org/show_bug.cgi?id=122212 which provides some hard data
"Some usage data from Chrome which may be helpful in having a data-oriented debate here:
- only 0.6% of taps lead to a double tap
- rises to 3.5% considering only sites where double tap is enabled
- 75% (and increasing) of pages loaded on Android have a mobile viewport
- 84% of taps (and increasing) occur on pages with a mobile viewport"
Wenson Hsieh
*** This bug has been marked as a duplicate of bug 150604 ***