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Bug 1605381 - Handle missing root element in test-wait, r=maja_zf

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Depends on D57995

Differential Revision: https://phabricator.services.mozilla.com/D57996

--HG--
extra : moz-landing-system : lando
This commit is contained in:
James Graham 2019-12-20 22:05:14 +00:00
parent 3d492f5489
commit 06c38cab2e
1 changed files with 2 additions and 1 deletions
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3
testing/web-platform/tests/tools/wptrunner/wptrunner/executors/test-wait.js
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@ -32,7 +32,8 @@ function wait_paints() {
}
function screenshot_if_ready() {
if (root.classList.contains("%(classname)s") &&
if (root &&
root.classList.contains("%(classname)s") &&
observer === null) {
observer = new MutationObserver(wait_paints);
observer.observe(root, {attributes: true});