[Webkit-unassigned] [Bug 204559] New: Webcomponents dynamic added slots do not work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204559

            Bug ID: 204559
           Summary: Webcomponents dynamic added slots do not work
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jochen.kuehner at gmx.de

Webcomponents dynamic added slots do not work

see code on https://jsfiddle.net/t2z4kp3n/1/

Result is

DivA
DivB
DivC

but should be

DivA
DivB
DivC
DivD

If you change order of 16-18 from

    let slot = document.createElement("slot");
    slot.name = "d";
    shadowRoot.appendChild(slot);

to

    let slot = document.createElement("slot");
    shadowRoot.appendChild(slot);
    slot.name = "d";

it works as expected.

Also look in chrome, it works as it should

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