Internal CSS
As the name suggests, an internal stylesheet sits inside the HTML document in the <head> section. You write down all styling rules inside the <style> element, which requires closing.
This type of applied style is pretty rare and works only if you need to add some unique properties to a single page. For websites with multiple pages, you'll be exhausted inserting the uniform internal stylesheet to every single page, not to mention changing one tiny piece of code in styling.
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