[Webkit-unassigned] [Bug 240440] New: frequently restyled content can spend significant time recomputing whether text nodes are entirely HTML space characters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240440

            Bug ID: 240440
           Summary: frequently restyled content can spend significant time
                    recomputing whether text nodes are entirely HTML space
                    characters
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: heycam at apple.com
                CC: webkit-bug-importer at group.apple.com

In the MotionMark Design subtest, we spend 1% of Web content process time in isAllSpecialCharacters<isHTMLSpace> under TreeResolver::resolveComposedTree.  This is because the cloned <table> elements that are used for the text trails have all white space text nodes between tags, and we end up looking through all those text node characters.  We can cache the result in a node flag to avoid this.

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