Bug 218651

The test sporadically fails with the following output:

Diff: https://build.webkit.org/results/WPE-Linux-64-bit-Release-Tests/r269433%20(20920)/imported/w3c/web-platform-tests/html/semantics/scripting-1/the-script-element/moving-between-documents/move-back-createHTMLDocument-success-external-classic-diff.txt

--- /home/buildbot/wpe/wpe-linux-64-release-tests/build/layout-test-results/imported/w3c/web-platform-tests/html/semantics/scripting-1/the-script-element/moving-between-documents/move-back-createHTMLDocument-success-external-classic-expected.txt
+++ /home/buildbot/wpe/wpe-linux-64-release-tests/build/layout-test-results/imported/w3c/web-platform-tests/html/semantics/scripting-1/the-script-element/moving-between-documents/move-back-createHTMLDocument-success-external-classic-actual.txt
@@ -1,8 +1,9 @@
+CONSOLE MESSAGE: exec
 
 
 PASS Sanity check around top-level Window
-PASS Eval: Move success external classic script to createHTMLDocument move-back
-PASS <script> load: Move success external classic script to createHTMLDocument move-back
+FAIL Eval: Move success external classic script to createHTMLDocument move-back assert_false: The script must not have executed in source window expected false got "executed"
+FAIL <script> load: Move success external classic script to createHTMLDocument move-back assert_unreached: Script load event fired unexpectedly Reached unreachable code
 PASS <script> error: Move success external classic script to createHTMLDocument move-back
 PASS window error: Move success external classic script to createHTMLDocument move-back

This test works fine in GTK.