[Webkit-unassigned] [Bug 215258] New: SVG textPath startOffset unitless decimals values are interpreted as relative to the path length

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Aug 6 23:58:43 PDT 2020


https://bugs.webkit.org/show_bug.cgi?id=215258

            Bug ID: 215258
           Summary: SVG textPath startOffset unitless decimals values are
                    interpreted as relative to the path length
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
               URL: https://codepen.io/gingerchris/pen/WNwbEym
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: chrisdowling84 at gmail.com
                CC: zimmermann at kde.org

Created attachment 406155

  --> https://bugs.webkit.org/attachment.cgi?id=406155&action=review

Image showing two textPaths, one with percentage and one with decimal startOffset - both render identical in Safari

When specifying a unitless decimal value for the startOffset attribute of a textPath element, I would expect the text to be indented by an absolute amount - the specified distance in the user's coordinate system (see https://www.w3.org/TR/SVG11/text.html#TextPathElementStartOffsetAttribute).  

EG. `startOffset="0.4"` I would expect to indent the text 0.4 units

Instead what happens is the decimal is interpreted as a fraction of the total path length.  So a value of `0.4` is the same as `40%`.

In the attached SVG and the linked CodePen the two textPaths should render with the text offset by different amounts.  In Safari they appear identical.

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