That timeline doesn't sound right to me. JS was rarely used to standardise behaviour - we had lots of user agent detection and relying on quirks ordering to force the right layout. JS really was for the interactivity at the beginning - DHTML and later AJAX. I don't think it even had easy access to layout related things? (I may be mistaken though) CSS didn't really make things more consistent either - once it became capable it was still a mess. Sure, CSS garden was great and everyone was so impressed with semantic markup while coding tables everywhere. It took ages for anything to actually pass first two ACIDs. I'm not sure frameworks ever really impacted the "consistent looks" side of things - by the time we grew out of jQuery, CSS was the looks thing.
Then again, it was a long time. Maybe it's me misremembering.
Then again, it was a long time. Maybe it's me misremembering.