Basically one just brings up a big editable content box in the url bar:
Code: Select all
data:text/html, <html contenteditable>
It's blank with no cursor. Just click to get your cursor and start typing.
You can easily increase or decrease the font size by the usual scaling of the browser (ctrl + / - ) usually.
You can also
search (ctrl-f)
save file (ctrl-s)
open file (ctrl-o)
I usually save the url in my bookmarks, but then edit the properties or rename it something like "text editor"
There are more complex versions of this documented online, but I nearly have this one memorized.

Just watch for common mistakes, like colons and semicolons, forgetting the comma and the space ....
Handy.