https://raw.githubusercontent.com/mozilla-firefox/firefox/main/testing/web-platform/tests/css/css-transitions/KeyframeEffect-target.tentative.html
CSSTransition.effect.target
effecttarget
https://raw.githubusercontent.com/mozilla-firefox/firefox/main/testing/web-platform/tests/css/css-transitions/CSSTransition-effect.tentative.html
CSSTransition.effect
effect
https://raw.githubusercontent.com/mozilla-firefox/firefox/main/testing/web-platform/tests/css/css-transitions/CSSTransition-transitionProperty.tentative.html
CSSTransition.transitionProperty
https://raw.githubusercontent.com/mozilla-firefox/firefox/main/testing/web-platform/tests/css/css-transitions/CSSTransition-ready.tentative.html
CSSTransition.ready
ready