imported/w3c/web-platform-tests/html/user-activation/basic.html Times out creating the window inside the async_test step function inside the click event handler. It seems to get stuck somewhere in the creation of the new WebPage on the WebProcess. http://wpt.live/html/user-activation/basic.html works fine with WPE's MiniBrowser though, so looks like something related to WTR/runner support in WPE.