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So the property we actually set is className. Grab the element and set its .className property to whatever the name of your class is in your CSS file. If you need to clear it, you can actually clear just by setting it equal to an empty string. So let's see a couple of examples.
Access exercise files from a button right under the course name.
Search within course videos and transcripts, and jump right to the results.
Remove icons showing you already watched videos if you want to start over.
Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.
Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.