HTML and CSS Reference
In-Depth Information
Note
Notice that there is not a keyword to override disabling plug-ins. The reason for
this is a plug-in could be built that circumvented some of the other restrictions, present-
ing a vulnerability to any selective restrictions in place. Therefore, plug-ins are always
disabled as long as the
sandbox
attribute is present.
Targeting inline frames
The
iframe
has one last attribute—which isn't new—the
name
attribute, which can be
used to identify a particular inline frame among other inline frames used on a page. Do-
ing so means a particular inline frame can be used as a target for links when the
target
attribute is set to a particular inline frame's name. Here's an example:
<iframe name="terms" src="tnc.html">
<a href="tnc.html" target="_blank">View Terms and
Conditions</a>
</iframe>
<a href="page2.html" target="terms">Next page</a>
In this case, when the “Next page” hyperlink text is clicked, the
page2.html
page
is loaded into the “terms” inline frame.
Video
More than any other element, the
video
element is what brought HTML5 into the
public consciousness. To the wider public that just uses the Web, it became known
that videos on YouTube could not be viewed on the iPhone/iPad because YouTube
“HTML5” that could display video on the iPhone/iPad. Exactly what that meant was
no doubt lost on the majority of users of the Web, but for you and others like you, it
means there is a new element,
video
, that allows video files to be embedded into a
web page without the use of any third-party plug-ins. It means native video playback in
the browser. This differs from using
object
for video playback, because
object
just
hands the video content off to a plug-in.
___________
6
YouTube still predominantly uses Flash, but it has an HTML5 player at
www.youtube.com/htm-
l5
, and videos viewed with a device that does not support Flash will fall back to using this HTML5
video player.
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