Browser engine-specific WPT failures (opens in new tab)

This graph shows the number of engine-specific failures over time, for Blink (Chromium browsers), Gecko (Firefox), and WebKit (Safari). The y-axis is the number of tests that fail in exactly one engine, normalized to account for subtests (to learn more about subtests and how they're normalized here, see the source code). The x-axis is the date of the test run.