[Webkit-unassigned] [Bug 188752] New: slotchange event does not fire with initial content

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188752

            Bug ID: 188752
           Summary: slotchange event does not fire with initial content
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jan at component.kitchen
                CC: cdumez at apple.com

See http://jsbin.com/wirubeq/edit?html,console,output.

In Chrome/Firefox, when a component with light DOM content is attached to the document, and a slot is created with a slotchange listener, the slot will raise an initial slotchange event. Safari does not do this.

The Chrome/Firefox behavior is useful because it allows a component to concentrate its initial content processing in a slotchange handler. To get consistent behavior, we have to normalize the slotchange behavior across browsers, which is cumbersome.

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