[Webkit-unassigned] [Bug 186355] New: All WebKit based browsers render <meter> elements in an unexpected way

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186355

            Bug ID: 186355
           Summary: All WebKit based browsers render <meter> elements in
                    an unexpected way
           Product: WebKit
           Version: Safari 11
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: chris+webkitbugzilla at xenforo.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Hello

I'm hesitant to report this as technically it isn't all WebKit based browsers. It also affects Blink (Chrome) and EdgeHTML (MS Edge) and it only works correctly (in my mind, at least) in Mozilla browsers.

But, certainly, in the cases that are (in my opinion) incorrect, the common factor appears to be WebKit (assuming that Blink is a fork and Microsoft tend to be more closely mirroring WebKit in its standards).

Anyway, it's quite simple. Open the following URL in both Safari/Chrome and Firefox:

https://jsfiddle.net/chrisxf/kqxt5pfa/

You will see that in WebKit browsers both value 3 and 4 are green, whereas in Firefox only value 4 is green, and value 3 is yellow.

I've noted what the expected results are and explained the logic for that.

It's entirely possible that the bug is on Mozilla's side, but the logic I've written seems to make the most sense to me and suggests that WebKit could be wrong. It could also be possible my logic is just totally wrong...

Any advice or future fixes appreciated.

Chris

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