ISSUE-2040: Consider adding placeholders or fallback for unresolved resources

image fallback

Consider adding placeholders or fallback for unresolved resources

State:
RAISED
Product:
SVG 2
Raised by:
Doug Schepers
Opened on:
2008-08-24
Description:
When a resource (like an image href) can't be resolved, SVG should put some sort of checkerboard or broken-link indicator (perhaps in the status bar) to indicate to the user that the SVG is not rendering as intended by the author.

Consider wording or functionality like the following to linking.html:

<p id="fallback">If an element in the <a href="intro.html#TermRenderingTree"><span class="svg-term">rendering tree</span></a> (e.g., <a href="struct.html#UseElement"><span class="element-name">'use'</span></a>, <a href="struct.html#ImageElement"><span class="element-name">'image'</span></a>, <a href="multimedia.html#AnimationElement"><span class="element-name">'animation'</span></a>, <a href="multimedia.html#AudioElement"><span class="element-name">'audio'</span></a>, <a href="multimedia.html#VideoElement"><span class="element-name">'video'</span></a>) has an unresolved reference for the <a href="animate.html#HrefAttribute"><span class="attr-name">'xlink:href'</span></a> attribute, the user agent must display instead any fallback content supplied as a child of the element, in the following order of preference: any element in the <a href="intro.html#TermRenderingTree"><span class="svg-term">rendering tree</span></a> which does not contain invalid references, or its child content that matches the same criteria; or the contents of any <a href="struct.html#TitleElement"><span class="element-name">'title'</span></a> or <a href="struct.html#DescElement"><span class="element-name">'desc'</span></a> element. If no adequate fallback content is supplied, the user agent should provide a placeholder rectangle with a gray checkerboard pattern or an image with the position and dimensions specified by the element's attributes, if specified, or custom dimension otherwise, and the name of the invalid resource as visible text or as a tooltip. If fallback content is rendered, the user agent may display an outline of the content, to indicate that the primary element contained an invalid resource. For more details, see the <a href="intro.html#TermBoundingBox"><span class="svg-term">bounding box</span></a> definition.</p>

NOTE: Closed ISSUE-2045 since it was a duplicate of this issue, though note the wording in there from bugzilla.
Related Actions Items:
Related emails:
  1. Fwd: Minutes, SVG f2f Mountain View, Thurs 27 Oct 2011 (from cam@mcc.id.au on 2011-10-28)
  2. Minutes, SVG f2f Mountain View, Thurs 27 Oct 2011 (from chris@w3.org on 2011-10-28)
  3. Re: Canvas in SVG, was: Re: minutes, SVG WG Seattle F2F 2011 day 1 (from chuck@jumis.com on 2011-07-29)
  4. Minutes, May 20 2009 SVG WG telcon (from anthony.grasso@cisra.canon.com.au on 2009-05-20)
  5. Agenda, May 20 2009 SVG WG telcon (from ed@opera.com on 2009-05-19)
  6. ISSUE-2040 (image fallback): Consider adding placeholders or fallback for unresolved resources [SVG Core 2.0] (from sysbot+tracker@w3.org on 2008-08-24)

Related notes:

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