Re: Firefox 22 hidden NPAPI

[email protected] Fri, 5 Jul 2013 04:11:42 -0700 (PDT)

Newsgroups	gmane.comp.mozilla.devel.plugins
Message-ID	<[email protected]>

On Thursday, July 4, 2013 5:24:15 PM UTC+3, Boris Zbarsky wrote:
> On 7/4/13 4:06 AM, [email protected] wrote:
> 
> > It seems that the NPAPI plugins which have the attribute hidden="true" in an 'embed' element are not loaded.
> 
> > 1. Is this a new feature in firefox 22?
> 
> 
> 
> It's a fix for a spec compliance bug.
> 
> 
> 
> In Firefox 21, <embed> styled with display:none does not instantiate the 
> 
> plug-in.
> 
> 
> 
> Per HTML5 spec, the "hidden" attribute makes the element be styled with 
> 
> display:none.
> 
> 
> 
> In Firefox 21, we do that for all elements _except_ <embed>.
> 
> 
> 
> Firefox 22 removed the exception for <embed> so that we are now 
> 
> following the spec.
> 
> 
> 
> Do other UAs do something different here?  If so, what?
> 
> 
> 
> > 2. What is the best solution/workaround for this?
> 
> 
> 
> width=0 height=0 instead of the hidden=true, probably.
> 
> 
> 
> -Boris

Thank you!

It seems that width=0 height=0 does not suffice, the element is still taking some space. This is how I've tested:

<!DOCTYPE HTML>
<html>
  <body>
    <p>Before embed</p>
    <embed type="video/ogg" style="visibility:hidden;width:0px;height:0px;margin:0px;padding:0px;border-style:0px;border-width:0px;max-width:0px;max-height:0px" />
    <p>After embed</p>
  </body>
</html>