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I was writing a simple web page. And I wanted to print <abc> and <1234> inside the page. Why <1234> is printed not <abc>? I know <abc> is invalid tag thats why it is not rendered. But what about <1234>?
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This is down to the way that browsers parse the HTML into a format that gets displayed as a web page.
As a rule, HTML tags must start with letters. Because of this, the browser attempts to parse as a valid tag (therefore hiding it), but doesn't recognise <1234> and therefore leaves it untouched.
Edit:
As @Arkana pointed out below, there's nothing I can see in the HTML specification that specifically forbids starting a HTML tag with a number. My best guess is that because no (currently valid) HTML tags actually do start with a number, the browser's parser just ignores these tags, based on the same rule that IDs and Names follow according to the HTML4 spec.
72
You have to do it like:
and <1234>
Use HTML entities.
< = <
> = >
Using them tells HTML that you want the < and > to be displayed as it is and not be interpreted as the < and > in <html>
P.S.: Here's a list of them.
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