This looks to be timing out on OSX webrender opt so far: https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&revision=0bc6d559d01347f397c4af074cf7f36990653ce0&test_paths=devtools%2Fclient%2Finspector%2Fmarkup%2Ftest%2F Retriggered on other platforms to see the timeout rate.
Bug 1706806 Comment 8 Edit History
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This looks to be timing out on OSX webrender opt/debug so far: https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&revision=0bc6d559d01347f397c4af074cf7f36990653ce0&test_paths=devtools%2Fclient%2Finspector%2Fmarkup%2Ftest%2F Retriggered on other platforms to see the timeout rate.