[Webkit-unassigned] [Bug 205563] New: Precision of getClientRects(), getBoundingClientRect() differs depending whether simple line layout or line box layout is used
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Dec 23 11:32:42 PST 2019
https://bugs.webkit.org/show_bug.cgi?id=205563
Bug ID: 205563
Summary: Precision of getClientRects(), getBoundingClientRect()
differs depending whether simple line layout or line
box layout is used
Product: WebKit
Version: WebKit Local Build
Hardware: All
OS: All
Status: NEW
Severity: Normal
Priority: P2
Component: Text
Assignee: webkit-unassigned at lists.webkit.org
Reporter: dbates at webkit.org
CC: mmaxfield at apple.com
While looking into bug #205527, I noticed that the rects returned by getClientRects(), getBoundingClientRect() differ in precision depending on whether they were computed using the simple line layout or line box layout code.
Steps to reproduce:
1. Open the test case attached to bug #205527: attachment #386273.
Compare the rectangle returned under "getClientRects: Before selection:": <-- simple line layout
{"x":8,"y":26,"width":28.453125,"height":18,"top":26,"right":36.453125,"bottom":44,"left":8}
to the **second** rectangle returned under "getClientRects: After selection:": <-- line box layout
{"x":8,"y":26,"width":29,"height":18,"top":26,"right":37,"bottom":44,"left":8}
^^^ The width using simple line layout is 28.453125, but is 29 using line box layout.
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