CSS
ProficiencyStyle sheets are a great way to manage visual output on a page.
From a mechanical standpoint, you can edit a few lines near the top of an HTML document to control the whole page’s formatting. Or better yet, you can edit one file on the web server and have multiple pages change their look and feel.
As an HTML designer, I like such features as the formatting capabilities of setting a font’s point size. This tries to ensure that the fonts will display in the same way from machine to machine, regardless of a specific user’s font size setting in the browser. Any amount of predictability that can be added to HTML outputting helps a great deal.
All in all, CSS is an indispensable tool when authoring HTML pages.
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