Top "W3c" questions

The World Wide Web Consortium (W3C) is an international community that develops and publishes specifications and guidelines that define technologies like XML, HTML, and CSS.

Is the copyright meta tag valid in HTML5?

<meta name="copyright" content="By Me" /> W3C validator output: Line 5, Column 41: Bad value copyright for attribute name …

html validation w3c
Can a CSS pixel be a fraction?

Can a CSS px be a fraction? Is it allowed by the standards? And if so, do the major browsers …

css w3c
XHTML Strict 1.0 - target="_blank" not valid?

I just validated my actual XHTML Strict 1.0 doc with the w3c validator service.. and it says that, <ul …

html validation target w3c xhtml-1.0-strict
Can a <small> tag be inside an HTML5 heading (i.e. h1, h2, h3, etc...)?

I'm not sure about the convention regarding headings in HTML5, but I wanted to know if I could add a &…

html w3c
Is use of <u>underline</u> deprecated and non validated?

Is use of underline deprecated and non validated?

html xhtml w3c
IE8 does not support querySelectorAll

I tried to use document.querySelectorAll(), but IE8 throw error, that Object doesn't support this property or method var titleCheckBox = …

javascript internet-explorer-8 w3c selectors-api
Is it valid to have paragraph elements inside of a heading tag in HTML5 (P inside H1)?

Is it ok to have paragraph elements inside of a header tags in HTML5? In other words: is this markup …

css html w3c
Can a td be inside a td

It may be a nonsense question, and I know we have to follow standards as much as possible. But can &…

html html-table w3c w3c-validation
Navigator.sendBeacon() to pass header information

I am using navigator for communicating with the server , but problem is that we need to pass some header information …

javascript w3c
Google +1 Button not W3C compliant

So I've been playing with Google's +1 button trying to get it on my website, but it's not W3C compliant. …

javascript w3c w3c-validation google-plus-one