[Webkit-unassigned] [Bug 273336] requestAnimationFrame glitches detected on touchstart/touchend/pointerdown/pointerup op

Tue Jul 9 21:14:46 PDT 2024

https://bugs.webkit.org/show_bug.cgi?id=273336

Evan Kyle <evankyle at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |evankyle at gmail.com

--- Comment #2 from Evan Kyle <evankyle at gmail.com> ---
Found on: 
iPhone 8 iOS 16.7.8 on touch events.
iPhone 11+ iOS 17.5.1 on touch events.
macOS 14.5 safari 17.5 (19618.2.12.11.6) mouse move events.

Looks like a duplicate of Bug 149578 from 2015

You can use this to see the bug in action.

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>late frame bug</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no" />
  </head>
  <body>
    <div id="log"></div>
    <script>
      const log = document.getElementById('log')
      let delta = 0
      let last = performance.now()
      function loop()
      {
        requestAnimationFrame((time) =>
        {
            delta = time - last
            last = time
            if(delta > 18)
            {
              log.innerText += `late ${delta}\n`
            }
            loop()
        })
      }
      loop()
    </script>
  </body>
</html>

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