I came through the same issue. Apparently this is a reported bug in WebKit. https://bugs.webkit.org/show_bug.cgi?id=215729 My investigation result shows the same: https://github.com/Danesz/SidewalkExample I have built a solution to overcome the problem. It is still in a proof-of-concept phase, missing some elements, but take a look on it: https://github.com/Danesz/Sidewalk Maybe it is good enough for your use-case. (and you can extend it anytime you want)