W3C home > Mailing lists > Public > www-validator@w3.org > October 2012

Re: The "" attribute on the iframe element is obsolete. Use CSS instead.

From: Jukka K. Korpela <jkorpela@cs.tut.fi>
Date: Thu, 18 Oct 2012 17:31:21 +0300
Message-ID: <508012B9.8040700@cs.tut.fi>
To: Michael Williams <mwilliams@westtexasretina.com>
CC: www-validator@w3.org
2012-10-10 22:11, Michael Williams wrote:

 > I have my page www.westtexasretina.com/contact.html
> <http://www.westtexasretina.com/contact.html>, I get 7 errors in regards
> to using iframe attributes rather than CSS

That's because the HTML draft declares those attributes as obsolete.

> I attempted to use CSS to
> control these attributes, however it did not get supported across all
> browsers

Such things may well happen. "Use CSS instead" expresses just a general 
idea, and it does not guarantee that you can actually replace the 
attribute by the use of CSS and have things working on all browsers. 
Generally, an obsolete feature tends to work more reliably than the 
recommended replacements.

In particular, on Chrome (and Safari), the scrollbars of an iframe 
cannot be removed using the standard CSS setting overflow: visible. The 
implementation is special, and you need to use a special nonstandard 
pseudoelement for the purpose:

   iframe::-webkit-scrollbar {
     display: none;

I learned this from

> I think it could be beneficial if obsolete attributes were referenced with
> the correct CSS attribute

That would go beyond the scope of HTML validation and would mean that 
the validator would need to be modified to reflect the status of CSS and 
its implementations. Moreover, it's often a matter of something more 
complicated than just using a CSS property. (As a terminology issue, 
HTML has attributes, CSS has properties.)

Received on Thursday, 18 October 2012 14:32:02 UTC

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