Separate the logic of turning on tabs in the tests for #turn-off
Add failing test for applyHTML
Make ElementDifference static variables const
Implement dispatch-in-window that returns a promise that resolves when the event handlers are executed.
Do not “mark” the dom in contet script.
Move served files away from html2js preprocessor to make karma serve my HTML
Reject dispatch-in-window promise if event target is not found
applyHTML re-implemented and it seems working for source frames.
Use border-color instead of color in unit tests because “color” is also the default value for many properties like border.