[Bug 16830] New: Provide a way to defer loading images until after the page has loaded


           Summary: Provide a way to defer loading images until after the
                    page has loaded
           Product: HTML WG
           Version: unspecified
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: mephiles@live.co.uk
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,

The BBC updated their BBC News mobile website, recently. One of the ways they
optimised it for mobile devices was by deferring loading images until after the
page has loaded.

I haven't looked into how this is done in detail, but they used DIVs for
placeholders in the positions where the images will go. For example:

<div class="delayed-image-load"

After the page has loaded, the DIV is changed into an IMG element.

Clearly, this isn't very semantic, and wouldn't work at all if JavaScript is
disabled. But they have a good reason for doing this, which is why I believe
there is a need for a way of deferring the loading of images until after the
page has been parsed. This could also be applied to other embedded content
elements, like IFRAME and OBJECT.

The way I think this should be done is by using the DEFER attribute, which
would work in the same way as it does in the SCRIPT element.

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Received on Tuesday, 24 April 2012 14:30:21 UTC