3
votes
1answer
216 views

Browsers treat vertical tab characters in input type=text differently. Is one of them correct?

In developing some server side validation I discovered that (the latest Windows versions as of this writing of) Firefox, Chrome and Internet Explorer handle vertical tab characters differently in ...
1
vote
1answer
116 views

Pages wrapped in a form element. What effect would this have on SEO or other machine-readability?

I'm helping somebody with a site and I've noticed that all the main pages are wrapped inside a form. I mean: <body> <form> [ everything in the page ] </form> </body> ...
10
votes
2answers
449 views

Is <a href=“#”>link</a> a broken link?

When using empty URL fragment links, to send a user to the top of the page (e.g. <a href="#">return to top</a>), are these links considered broken or invalid? One of my tools is returning ...
3
votes
1answer
2k views

Fixing validator error “cannot generate system identifier for general entity”

The W3C validator shows a "cannot generate system identifier for general entity" error when attempting to validate a page that contains the following code: <script type="text/javascript" ...
5
votes
1answer
201 views

HTML encoding in the alt attribute

Why is it that &#187; valid for an alt atribute but &raquo; is not?
-1
votes
1answer
146 views

What are the most common “normal” HTML errors? [closed]

I'm trying to find real-world HTML pages that are actually valid (in the sense that they are displayed by modern browsers), but are not compliant with HTML specification and are considered invalid. ...
5
votes
4answers
1k views

Does valid HTML, CSS and/or XML affect SEO?

Can a page's HTML validity affect search engine optimization (SEO)? Assuming all other factors are exactly equal, will an HTML document with 0 errors and 0 warnings (W3C provides a tool to validate ...
2
votes
1answer
5k views

How can I resolve HTML validation errors when using Facebook Comments?

I am trying to validate my document that has the following facebook comments tag <fb:comments width="425"></fb:comments> I am getting validation error: Line 333, Column 45: Element ...
1
vote
2answers
267 views

Link of image and text

I am currently linking related and text (caption) in the following way: <a href="/link"><img src="image.jpg" ... />This is caption</a> Meaning I combine both and text inside the ...
4
votes
4answers
2k views

Linux HTML/XML W3C Validation Utilities

What programs can I use to validate HTML/XML markup? Basically, I want a local, command-line based, version of W3C HTML validation service (like lint) that I can use for detecting errors. Update I ...
15
votes
5answers
6k views

How can I validate HTML offline?

When I'm developing a website locally sometimes I want to check if the html is valid but I haven't been able to find a good tool. I want it partial as a sanity check when I'm troubleshooting layout ...
44
votes
16answers
2k views

HTML validation: is it worth it?

What are the advantages and disadvantages (if any) of making sure that all pages validate compared to having non-valid HTML that however works on all major browsers? Also, is having valid HTML after ...