I didn’t use Photoshop. If you’re on Chrome and right-click the number, you’ll see “Inspect” in the menu. (Other browsers should have a similar feature) That will open Chrome’s dev tools, which lets you view and modify the HTML. Changes made will be rendered.
At its most basic, quickly changing HTML/CSS is a good tool for developers to test something out quickly. However, it’s possible to have fun with it in other ways, like faking something (like I did) or even sending (name removed by moderator)ut to a website that it otherwise wouldn’t make available (e.g. adding a value to a drop down menu). In the latter, case, it’s possible to cause weird behavior if the site’s web developer didn’t do proper (name removed by moderator)ut checking on the backend.