WebKit shouldn't accept "none, none" in transition property.

>If there is more than one <single-transition> in the shorthand, and any of the transitions has ‘none’ as the <single-transition-property>, then the declaration is invalid. http://dev.w3.org/csswg/css3-transitions/#transition-shorthand-property

by syoichi

JavaScript

(function (body) {
  body.style.transition = 'none, none';
  body.insertAdjacentHTML('AfterBegin', body.style.transition === '');
}(document.body));