We are failing a number of WPT tests where a keyframes uses an "inherit" value for a given property and that property changes on a parent dynamically. For instance, in web-animations/responsive/perspective.html:

test(function() {
    container.style.perspective = 'none';
    var player = element.animate([{perspective: 'inherit'}, {perspective: '20px'}], 4000);
    player.pause();

    player.currentTime = 1000;
    assert_equals(getComputedStyle(element).perspective, 'none');

    container.style.perspective = '100px';
    assert_equals(getComputedStyle(element).perspective, '80px');

    container.style.perspective = 'none';
    assert_equals(getComputedStyle(element).perspective, 'none');
}, 'perspective responsive to inherited changes');

This makes us fail a number of similar WPT tests under web-animations/responsive/.