scrollbar-inset-forward.html

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<!DOCTYPE html>

<!-- -moz-scrollbar-inset-block on an embedder must reach the subdocument's viewport

     scrollbar, which can't carry the property itself. Compared with != against

     an identical iframe that has no inset: if the forwarding through

     nsSubDocumentFrame -> BrowsingContext -> nsPresContext is broken, the two

     render identically and this fails. -->

<style>

  iframe {

    width: 200px;

    height: 300px;

    border: none;

    -moz-scrollbar-inset-block: 40px 0;

</style>

<iframe src="scrollbar-inset-forward-inner.html"></iframe>