There was once a time when the first thing you would do when you went to visit a newly-launched website was to run its markup through a validator.
Later on that was replaced by the action of bumping up the font size by a few notches—what Dan called the Dig Dug test.
Thanks to Ethan, we all started to make our browser windows smaller and bigger as soon as we visited a newly-launched site.
Now when I go to a brand new site I find myself opening up the “Network” tab in my browser’s developer tools to count the HTTP requests and measure the page weight.
Never bumped up the font-size, did have a phase of zapping the stylesheet often though (SHIFT+CMD+S was the shortcut in the web developer toolbar) 🙂