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<!DOCTYPE html>
<meta charset="utf-8">
<body>
Hello, world!
SOURCE FOR CODE
If so, besides removing "Hello, world!" is there any tag that's able to be removed and it still be valid, and how do you know it's still valid?
339
It's not valid. To check it you can run it in W3C Validator
The error is: Element head is missing a required instance of child element title.
...
UPDATE
As vcsjones stated the head element is optional. That's the title one is required. Credit to mootinator for pointing out that the body is also optional.
So the simplest valid document will be:
<!DOCTYPE html>
<title></title>
(Assuming the HTML syntax of HTML5.)
Note that in some situations the title element is optional, too.
From HTML5’s definition of head:
The
titleelement is a required child in most situations, but when a higher-level protocol provides title information, e.g. in the Subject line of an e-mail when HTML is used as an e-mail authoring format, thetitleelement can be omitted.
So the minimal markup for a document that gets a title from a "higher-level protocol" is this:
<!DOCTYPE html>
If the document is the value of an iframe-srcdoc it’s this (assuming a title is provided by the container document):
<html>
And for a stand-alone document it’s this (the title element needs some actual content, as noted by kapep, so the "…" is just an example):
<!DOCTYPE html>
<title>…</title>
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