1 files changed, 18 insertions, 0 deletions
diff --git a/testing/web-platform/tests/web-animations/resources/timing-override.js b/testing/web-platform/tests/web-animations/resources/timing-override.js
new file mode 100644
index 0000000000..a1d65030f0
--- /dev/null
+++ b/testing/web-platform/tests/web-animations/resources/timing-override.js
@@ -0,0 +1,18 @@
+// Firefox implements unconditional clamping of 20 usec; and for certain web-animation tests,
+// we hit some test failures because the Time Precision is too small. We override these functions
+// on a per-test basis for Firefox only.
+if(navigator.userAgent.toLowerCase().indexOf('firefox') > -1){
+  window.assert_times_equal = (actual, expected, description) => {
+    let TIME_PRECISION = 0.02;
+    assert_approx_equals(actual, expected, TIME_PRECISION * 2, description);
+  };
+
+  window.assert_time_equals_literal = (actual, expected, description) => {
+    let TIME_PRECISION = 0.02;
+    if (Math.abs(expected) === Infinity) {
+      assert_equals(actual, expected, description);
+    } else {
+      assert_approx_equals(actual, expected, TIME_PRECISION, description);
+    }
+  }
+}