The following layout test has been timing out in GTK since long ago. editing/selection/drag-to-contenteditable-iframe.html It may not be a GTK-specific problem though: platform/ios/TestExpectations 248:editing/selection/drag-to-contenteditable-iframe.html [ Skip ] platform/mac-wk2/TestExpectations 116:editing/selection/drag-to-contenteditable-iframe.html