[whatwg] seamless iframes

Ojan Vafai ojan at chromium.org
Wed Apr 4 18:59:09 PDT 2012

On Wed, Apr 4, 2012 at 6:52 PM, Ojan Vafai <ojan at chromium.org> wrote:

> 1.  We should add iframe[seamless] { display:block; }.
> http://www.whatwg.org/specs/web-apps/current-work/#embedded-content-2 already
> expects iframe:not([seamless]) { border: 2px inset; }. In 90% percent of
> uses, seamless iframes will not want a border and will want to fill their
> container. This way, seamless iframes behave roughly like sandboxable divs,
> which is what web developers want.
> 2. http://www.whatwg.org/specs/web-apps/current-work/#attr-iframe-seamless "In
> visual media, in a CSS-supporting user agent: the user agent should set the
> intrinsic width of the iframe to the width that the element would have if
> it was a non-replaced block-level element with 'width: auto'."
> This doesn't get the behavior you'd want with cases that need
> shrink-wrapped behavior. Some cases that need handling:
> <iframe seamless style="display:inline">
> <iframe seamless style="display:inline-block">
> <iframe seamless style="float:left">
> <iframe seamless style="position:absolute">

3. The default margin on the body element inside a seamless iframe should
be 0. Again, this is what 90%+ of uses will expect. We shouldn't require
everyone using seamless iframes to have to set the body's margin to 0.

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