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In html 5 this will/is simply &lt;!DOCTYPE HTML&gt;<br />
Now we just need to wait for the browsers to catch up
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In html 5 this will/is simply <!DOCTYPE HTML>
Now we just need to wait for the browsers to catch up

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It's good, answered the question!
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Hello,<br />
<br />
Like to know the purpose of header DOCTYPE? <br />
<br />
It can certainly work without it, but what affect does it have and why is it important? Is it anything to do with SEO? <br />

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Hello,

Like to know the purpose of header DOCTYPE? 

It can certainly work without it, but what affect does it have and why is it important? Is it anything to do with SEO? 


What's the purpose of DOCTYPE? What would happen without it?

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.