This is why HTML5 has only one doctype. That is the second one in your example. Improve this answer. Richard Hamilton Richard Hamilton Adrian Gheorghe Adrian Gheorghe 6 6 silver badges 11 11 bronze badges. Sign up or log in Sign up using Google.
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Now live: A fully responsive profile. As a web designer or developer, you will get the most consistent results by making sure that all browsers use their Standards rendering mode, hence you should stick to web standards, and use a proper doctype! There is no disadvantage to using this doctype, and it is certainly a lot easier to remember than the others! There are however, other doctypes that you may come across when working on various projects.
Let's look at some of the others you might bump into. The HTML 4. Again, it validates loose HTML style markup. If you want to use framesets and still have your markup validate, you can use one of these two doctypes:. They are functionally the same as HTML 4. But please don't use framesets: they are evil and outdated. We don't even tell you have to use them anywhere in this course. This is called quirks mode, and the browser basically regresses to an older rules engine to support all legacy tags it knows about and attempts to handle it.
This also means that your web page may not render or behave as expected, especially if you use newer tags or features in your document. The whole point is to get your web page to render and behave as you expect it, providing a better experience for you and your users. Visit the GitHub issue to view and write comments.
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