A way to draw (live) a square as a favicon, using Canvas.
The output can be used as a loading indication in the favicon.
A favicon is the small image displayed on browser tabs, near the name of the websites.
See the example at https://rpsthecoder.github.io/square-loading-favicon/
The favicon may not appear in all browsers. From my limited testing, it works in Chrome (75.0.3770.100) and Firefox (66.0.5)