[Webkit-unassigned] [Bug 258258] New: Update `:empty` pseudo-class to also match elements with only whitespace

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258258

            Bug ID: 258258
           Summary: Update `:empty` pseudo-class to also match elements
                    with only whitespace
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: slipped-gazette.0w at icloud.com

According to Selectors Level 4 (https://www.w3.org/TR/selectors-4/#the-empty-pseudo), the `:empty` pseudo-class should match whitespace-only elements. Currently it only matches elements with no child elements or content nodes.

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