[Webkit-unassigned] [Bug 177791] [ToT] Web process occasionally crashes when dropping into MDN's DataTransferItemList.add() demo

Mon Oct 2 17:08:44 PDT 2017

https://bugs.webkit.org/show_bug.cgi?id=177791

--- Comment #1 from Wenson Hsieh <wenson_hsieh at apple.com> ---
Here's a reduced test case.

<!DOCTYPE html>
<style>
div {
    padding: 15px;
    border: 1px solid black;
    font-size: 60px;
    font-family: -apple-system;
}
</style>
<body>
    <div draggable="true" id="source">source</div>
    <div id="target">target</div>
</body>
<script type="text/javascript">
source.addEventListener("dragstart", event => event.dataTransfer.items.add(event.target.id, "text/plain"));
source.addEventListener("dragend", event => event.dataTransfer.items.remove(0));
target.addEventListener("dragover", event => event.preventDefault());
target.addEventListener("drop", event => {
    for (const item of event.dataTransfer.items) {
        if (item.kind == "string" && item.type === "text/plain") {
            item.getAsString(string => event.target.appendChild(document.getElementById(string)));
            break;
        }
    }
    event.preventDefault();
});
</script>

Drag the source onto the target. I can't reproduce 100% of the time, but it happens every so often...

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