Chrome’s spell check is acting well enough to land a part in the show. Now, typos will have the browser’s dotted red line appear. (Users will only see their typos redlined. You will not get the callout on words collaborators added.)

For folks who don't need or want this feature, or those who do, here are the steps to turn it off/on:

...and here's a link straight from the 🐴's mouth.