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A negative outline-offset value should be clamped per spec as to stop it from becoming invisible with large negative values. Spec ref: https://www.w3.org/TR/css-ui-4/#outline-offset Also added a new WPT reftest for this case as no tests existed prior, updated related WPT expectations, and updated a few old layout reftests. Differential Revision: https://phabricator.services.mozilla.com/D185357