[Webkit-unassigned] [Bug 207567] New: :host() pseudo-selector reported as :host in CSSStyleRule

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207567

            Bug ID: 207567
           Summary: :host() pseudo-selector reported as :host in
                    CSSStyleRule
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jlo at logrocket.com

Created attachment 390393

  --> https://bugs.webkit.org/attachment.cgi?id=390393&action=review

Minimal reproduction case

Any |:host(selector)| rules in a stylesheet are incorrectly reported as plain |:host| pseudo-selectors when accessed through CSSStyleRule.prototype.cssText or CSSStyleRule.prototype.selectorText.

See the attached test case. In Chrome and FireFox the <pre> is populated with |:host(.hidden) { display: none; }|, using Safari (Mobile and Desktop) the output is |:host { display: none; }|.

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