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I'm using some HTML5 features on a web page and wondered what the best DOCTYPE is. Currently, this is the DOCTYPE and XMLNS:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
Should I use the new HTML 5 DOCTYPE?
<!DOCTYPE html>
Will older browsers (IE7, FF 2.x) recognize and render the page correctly? What's the best practice in this situation? Thanks.
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Correct Option: Ddoctype html>, doctype is the very first thing to write in HTML5.
The only thing that such a doctype change will affect is validation. Other than that, the doctype declaration only affects browser mode (quirks / almost standard / standard), and XHTML 1.0 and HTML5 doctype have the same effect in this respect. If you don't use a validator, there is no reason to change.
All HTML need to have a DOCTYPE declared. The DOCTYPE is not actually an element or HTML tag. It lets the browser know how the document should be interpreted, by indicating what version or standard of HTML (or other markup language) is being used.
In HTML version 4, there are three types of DOCTYPES can be used: strict,transitional and frameset. In this tutorial, we will discuss all these categories with adequate examples to help you to understand how to declare a doctype in an HTML page and how a valid HTML page looks like.
Yes, older browsers will work fine. The reason "<!DOCTYPE html>" was chosen in HTML 5 is because it is the smallest a doctype can be and yet still trigger standards compliance mode on those browsers you mention.
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