XHTML, eXtensible HyperText Markup Language, is an application of HTML that is also a valid XML document, as opposed to standard HTML which is based on SGML. It is a markup language commonly used for webpages.

learn more… | top users | synonyms

14
votes
8answers
3k views

Should I use HTML5 and/or CSS3 to build my website?

The new HTML5/CSS3 (Web8!) stuff sounds cool! Should I start using it now or stick with css/xhtml wait until more browsers can use it?
14
votes
11answers
2k views

Common optimizations to reduce HTML or XHTML page size?

What are some common optimizations performed to reduce HTML or XHTML page size? Some that come to mind are: removing comments, removing extraneous whitespace, moving repetitive inline styles to a ...
3
votes
2answers
263 views

As a beginner, I would like to know which should be the markup language to startup with [closed]

I am a beginner in Web Designing. For sure a CMS like Joomla (Joomla 3.1, now) is very useful for one who doesn't care about coding. But... I know for sure that the ability of coding really helps a ...
21
votes
10answers
1k views

What is new in HTML5/CSS3?

I've seen this site and this site, but that's a lot to digest. What are the main things about HTML5 that make it different/better than regular old (X)HTML/CSS?
2
votes
1answer
84 views

Can changing websites from XHTML 1.0 to HTML5 affect rendering in older browsers like Internet Explorer 8?

We are considering the pros and cons of switching from XHTML 1.0 Transitional to HTML5 for our website (for instance, to enhance our SERP positions by using microdata and new specific HTML5 tags for ...
2
votes
6answers
260 views

Is it important to have semantically correct HTML with regards to SEO?

SEO seems to be a subject surrounded by both myths and varying opinions. Nevertheless, I would like to know if you have an opinion on how important it is to have semantically correct XHTML, that is, ...
1
vote
1answer
63 views

When updating to HTML5, will adding <!doctype html>, <article>, and microdata result in rendering problems in older browsers?

When updating our website from XHTML to HTML5, will changing the following things result in rendering problems for our site in older browsers like Internet Explorer 8: Specify <!doctype html>. ...
1
vote
2answers
116 views

Is it bad to have a mix of HTML 5 and XHTML pages within one website from SEO perspective?

We are going to update our website from well-formed XHTML 1.0 Transitional to HTML 5. However, as I see, we will be doing this step-by-step. This means we will have some pages in HTML 5 and others in ...
1
vote
3answers
226 views

Is my Document Type Definition Still Up to Date?

currently all my php generated rich html webpages start with this line, which I have been adding to my tempaltes YEARS ago... <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ...