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Questions tagged [doctype]

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3 votes
3 answers

What will happen if I don't include the HTML DOCTYPE tag? [closed]

I know adding <!DOCTYPE html> (if using HTML5) on the first line is mandatory. What will happen if I don't include it? Because my site still looked the same when I removed it. <!DOCTYPE html&...
0 votes
1 answer

How are the <!DOCTYPE> and <html> tags important for SEO ranking?

I'd like to compare the two sites: Site A: <!DOCTYPE html> <html lang=en_US> <head> Site B: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "
1 vote
3 answers

Mutlitple <!DOCTYPE html>s in a webpage

I have a site which is divided into templates and sub-items for tempates in the backend's template language. However the sub-templates which are embedded into main templates each start with<!...
3 votes
1 answer

Are there any problems with pages from the same site using different doctypes?

After a re-design of some pages in our site, we have the new re-designed pages with doctype HTML5 and all the rest pages (that are not yet redesigned) with doctype XHTML 1.0 Transitional. Does that ...
1 vote
1 answer

Why is my DOCTYPE showing up as red italic in Firefox page source?

When viewing my page in Firefox page source, I am getting the first line in red italic: What is causing this and is it an issue?
3 votes
2 answers

Strict XHTML doctypes

I was wondering about the consequences of building a site that's compliant with XHTML1.0 Strict. I have developed a lot of sites using the transitional doctype, and read about the consequences of a ...
3 votes
1 answer

Universal shortened doctype for all mobile devices

I am trying to make my AdSense code load closer to the beginning of my mobile website code. My major bottleneck is the doctype declaration. What I have (as shown) is the doctype mobile profile 1.2 ...
4 votes
1 answer

HTML5 doctype & SEO

I am trying to get my pages validated using Markup Validation Service on W3C validator. We are getting validation against the XHTML 1.0 Strict doctype comes back with the following error: […] ...