[Webkit-unassigned] [Bug 252075] New: Zoom level factored into computed value of lh (line-height) unit used in CSS gradient

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=252075

            Bug ID: 252075
           Summary: Zoom level factored into computed value of lh
                    (line-height) unit used in CSS gradient
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dan at danburzo.ro

Created attachment 464947

  --> https://bugs.webkit.org/attachment.cgi?id=464947&action=review

A demonstration of how 1lh changes as you zoom in and out of the page

When used in a linear-gradient() CSS image, the computed value of `1lh` incorrectly changes based on zoom level.

In the attached test case, the paragraph has these styles:

p {
  line-height: 1.3;
  font-size: 20px;
  padding: 1lh;
  margin: 1lh;
  border: 1px solid;
  background-image: linear-gradient(
    transparent 0 1lh,
    #fc0 1lh 2lh,
    transparent 2lh 100%
  );
}

Zooming in and out of the page, the `margin` and `padding` are computed to `26px`, but the background image that highlights the first line of the paragraph gets out of sync.

The issue is not present in Chrome 109+.

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