[Webkit-unassigned] [Bug 102559] New: Text Autosizing: Ensure line-height is >= font-size, when autosizing single-line text

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102559

           Summary: Text Autosizing: Ensure line-height is >= font-size,
                    when autosizing single-line text
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://www.flickr.com/tour/#section=share-your-photos
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: johnme at chromium.org
                CC: timvolodine at chromium.org
            Blocks: 84186


Created an attachment (id=174757)
 --> (https://bugs.webkit.org/attachment.cgi?id=174757&action=review)
Screenshot of flickr.com heading

Some sites set the line-height smaller than the font-size on single-line headings, as an alternative way of reducing the heading's top/bottom margins.

When these single-line headings are autosized, if they wrap onto more than one line the line spacing between the lines will be insufficient.

For example the "Share your photos with your friends and family" heading on the attached screenshot has font-size:30px but line-height:20px, hence the top of the 'f' risks overlapping the bottom of the 'y' (much worse examples are possible!).

Text Autosizing should make sure that whenever single-line text is made to wrap onto multiple lines, the intra-line spacing is always at least ~1em (ideally this would be done without affecting the margins implied by the line height).

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