Bug 246914

We fail this subtest in web-animations/interfaces/Animation/commitStyles.html: test(t => { const div = createDiv(t); div.style.fontSize = '10px'; const animation = div.animate( { lineHeight: '1.5' }, { duration: 1, fill: 'forwards' } ); animation.finish(); animation.commitStyles(); animation.cancel(); assert_numeric_style_equals(getComputedStyle(div).lineHeight, 15); assert_equals(div.style.lineHeight, "1.5", "line-height is committed as a relative value"); div.style.fontSize = '20px'; assert_numeric_style_equals(getComputedStyle(div).lineHeight, 30, "Changes to the font-size should affect the committed line-height"); }, 'Commits relative line-height'); This is because of BuilderConverter::convertLineHeight() where a line-height specified as a percentage is stored as a LengthType::Fixed, while a line-height specified as number is stored as LengthType::Percent. We'll somehow need to account for `specifiedLineHeight()`.