Video and audio: playing media in the browser - HTML5 in Action - page 370

Listing 8.21. index.html—Modifying the draw() function to show the path
Step 3: Add a Clear button so users can remove telestrations and start again
As a final step you need to add a Clear button so users can remove their telestrations and
start again. An easy place to put this is in the controls menu you already have, by adding
another button:
<button>Clear</button>
The new case for your big switch statement is shown in the next listing.