And afterwards xhtml arrived alongside, with its XML rule that every component will need to have a closing tag, and other people just assumed that HTML was the exact same factor. So the specifications gave up, and ended up later revised to toss up their fingers to the fact.
XML needs all tags to possess a corresponding closing tag. So You will find a Distinctive short-hand syntax for tags with no internal contents.
I have tried using checking other solutions, but I'm still puzzled — especially just after observing W3schools HTML five reference.
Edit: Given that we are all nuts about specs, I believe it well worth stating that In line with dev.w3.org:
You shouldn't provide it with the XML declaration if applying text/html, however the written content may be usually legitimate XML (e.g. produced from something which outputs XML, like XSLT output or an item that serializes to XML).
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But it really has no outcome. It's overlooked whether it is there. If the / was a most popular bit of the syntax, the typical would say really should in lieu of could.
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and don't satisfy the requirements of XML and XHTML as they would not have closing tags, eg: or are legitimate, is just not valid XHTML or XML. HTML, of course, does not have the effectively-formed need so and are legitimate in HTML only.
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Both of those and they are suitable in HTML5, but from the spirit of HTML, must be applied. HTML5 permits closing slashes so as to be more compatible with documents that were Beforehand HTML 4.