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-rw-r--r--testing/web-platform/tests/common/rendering-utils.js19
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diff --git a/testing/web-platform/tests/common/rendering-utils.js b/testing/web-platform/tests/common/rendering-utils.js
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+++ b/testing/web-platform/tests/common/rendering-utils.js
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+"use strict";
+
+/**
+ * Waits until we have at least one frame rendered, regardless of the engine.
+ *
+ * @returns {Promise}
+ */
+function waitForAtLeastOneFrame() {
+ return new Promise(resolve => {
+ // Different web engines work slightly different on this area but waiting
+ // for two requestAnimationFrames() to happen, one after another, should be
+ // sufficient to ensure at least one frame has been generated anywhere.
+ window.requestAnimationFrame(() => {
+ window.requestAnimationFrame(() => {
+ resolve();
+ });
+ });
+ });
+}