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-rw-r--r--layout/reftests/web-animations/animation-utils.js13
1 files changed, 13 insertions, 0 deletions
diff --git a/layout/reftests/web-animations/animation-utils.js b/layout/reftests/web-animations/animation-utils.js
new file mode 100644
index 0000000000..d34ba635a1
--- /dev/null
+++ b/layout/reftests/web-animations/animation-utils.js
@@ -0,0 +1,13 @@
+function waitForIterationChange(animation) {
+ var initialIteration = animation.effect.getComputedTiming().currentIteration;
+ return new Promise(resolve => {
+ window.requestAnimationFrame(handleFrame = () => {
+ if (animation.effect.getComputedTiming().currentIteration !=
+ initialIteration) {
+ resolve();
+ } else {
+ window.requestAnimationFrame(handleFrame);
+ }
+ });
+ });
+}