Unfortunately, while bug 1651050 does fix this particular testcase, the mechanism by which it does so is largelt incidental. Attached is a slightly modified testcase which still demonstrates the underlying issue. **STR** Same as the original testcase (try scrolling the "Example Domain" iframe right after page load). **Expected results** The iframe contents scroll. **Actual results** The page contents scroll instead. If you scroll the area outside the iframe first, then subsequent scrolling over the iframe succeeds.
Bug 1645433 Comment 11 Edit History
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Unfortunately, while bug 1651050 does fix this particular testcase, the mechanism by which it does so is largely incidental. Attached is a slightly modified testcase which still demonstrates the underlying issue. **STR** Same as the original testcase (try scrolling the "Example Domain" iframe right after page load). **Expected results** The iframe contents scroll. **Actual results** The page contents scroll instead. If you scroll the area outside the iframe first, then subsequent scrolling over the iframe succeeds.