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Add the about:invalid registration.
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‎css3-values/Overview.html‎

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<h1>CSS Values and Units Module Level 3</h1>
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<h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 5 July 2012</h2>
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<h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 9 July 2012</h2>
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<dl>
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<dt>This version:
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<dd><a
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href="http://www.w3.org/TR/2012/ED-css3-values-20120705/">http://www.w3.org/TR/2012/ED-css3-values-20120705/</a>
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href="http://www.w3.org/TR/2012/ED-css3-values-20120709/">http://www.w3.org/TR/2012/ED-css3-values-20120709/</a>
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<dt>Latest version:
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References: ‘<code class=css>attr()</code>’</a>
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</ul>
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<li><a href="#iana"><span class=secno>9. </span> Appendix A: IANA
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Considerations </a>
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<ul class=toc>
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<li><a href="#about-invalid"><span class=secno>9.1. </span> Registration
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for the <code>about:invalid</code> URL scheme</a>
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</ul>
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<li class=no-num><a href="#acknowledgments">Acknowledgments</a>
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<li class=no-num><a href="#conformance"> Conformance</a>
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<ul class=toc>
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<li><a href="#conventions"><span class=secno>8.4. </span> Document
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conventions</a>
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<li class=no-num><a href="#conventions"> Document conventions</a>
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<li><a href="#conformance-classes"><span class=secno>8.5. </span>
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Conformance classes</a>
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<li class=no-num><a href="#conformance-classes"> Conformance classes</a>
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<li><a href="#partial"><span class=secno>8.6. </span> Partial
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implementations</a>
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<li class=no-num><a href="#partial"> Partial implementations</a>
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<li><a href="#experimental"><span class=secno>8.7. </span> Experimental
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<li class=no-num><a href="#experimental"> Experimental
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implementations</a>
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<li><a href="#testing"><span class=secno>8.8. </span> Non-experimental
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<li class=no-num><a href="#testing"> Non-experimental
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implementations</a>
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<li><a href="#cr-exit-criteria"><span class=secno>8.9. </span> CR exit
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criteria</a>
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<li class=no-num><a href="#cr-exit-criteria"> CR exit criteria</a>
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</ul>
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<li class=no-num><a href="#references">References</a>
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Note this means that rounding errors <em>may</em> accumulate.
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-->
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<h2 id=iana><span class=secno>9. </span> Appendix A: IANA Considerations</h2>
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<h3 id=about-invalid><span class=secno>9.1. </span> Registration for the
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<code>about:invalid</code> URL scheme</h3>
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<p> This sections defines and registers the <code>about:invalid</code> URI,
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in accordance with the registration procedure defined in <a
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href="http://tools.ietf.org/html/draft-ietf-appsawg-about-uri-scheme-07">the
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about: uri scheme RFC draft</a>.
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<table>
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<tbody>
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<tr>
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<th>Registered Token
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<td>invalid
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<tr>
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<th>Intended Usage
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<td> The <code>about:invalid</code> URI references a non-existent
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document with a generic error condition. It can be used when a URI is
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necessary, but the default value shouldn't be resolveable as any type
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of document.
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<tr>
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<th>Contact/Change controller
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<td>CSS WG &lt;<a href="mailto:www-style@w3.org">www-style@w3.org</a>>
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(on behalf of W3C)
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<tr>
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<th>Specification
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<td>CSS Values and Units Module Level 3
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</table>
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<h2 class=no-num id=acknowledgments>Acknowledgments</h2>
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<p>Comments and suggestions from Giovanni Campagna, Christoph Päper, Keith
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<h2 class=no-num id=conformance> Conformance</h2>
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<h3 id=conventions><span class=secno>8.4. </span> Document conventions</h3>
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<h3 class=no-num id=conventions> Document conventions</h3>
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<p>Conformance requirements are expressed with a combination of descriptive
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assertions and RFC 2119 terminology. The key words “MUST”, “MUST
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<p class=note>Note, this is an informative note.
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<h3 id=conformance-classes><span class=secno>8.5. </span> Conformance
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classes</h3>
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<h3 class=no-num id=conformance-classes> Conformance classes</h3>
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<p>Conformance to CSS Values and Units Level 3 is defined for three
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conformance classes:
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module, and meet all other conformance requirements of style sheets as
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described in this module.
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<h3 id=partial><span class=secno>8.6. </span> Partial implementations</h3>
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<h3 class=no-num id=partial> Partial implementations</h3>
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<p>So that authors can exploit the forward-compatible parsing rules to
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assign fallback values, CSS renderers <strong>must</strong> treat as
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unsupported values must be), CSS requires that the entire declaration be
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ignored.
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<h3 id=experimental><span class=secno>8.7. </span> Experimental
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implementations</h3>
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<h3 class=no-num id=experimental> Experimental implementations</h3>
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<p>To avoid clashes with future CSS features, the CSS2.1 specification
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reserves a <a
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vendor-prefixed syntax for such features, including those in W3C Working
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Drafts. This avoids incompatibilities with future changes in the draft.
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<h3 id=testing><span class=secno>8.8. </span> Non-experimental
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implementations</h3>
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<h3 class=no-num id=testing> Non-experimental implementations</h3>
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<p>Once a specification reaches the Candidate Recommendation stage,
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non-experimental implementations are possible, and implementors should
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href="http://lists.w3.org/Archives/Public/public-css-testsuite">public-css-testsuite@w3.org</a>
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mailing list.
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<h3 id=cr-exit-criteria><span class=secno>8.9. </span> CR exit criteria</h3>
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<h3 class=no-num id=cr-exit-criteria> CR exit criteria</h3>
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<p> For this specification to be advanced to Proposed Recommendation, there
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must be at least two independent, interoperable implementations of each
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<li>attr(), <a href="#attr" title="attr()"><strong>8.3.</strong></a>
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<li>authoring tool, <a href="#authoring-tool"
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title="authoring tool"><strong>8.5.</strong></a>
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title="authoring tool"><strong>#</strong></a>
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<li>calc(), <a href="#calc" title="calc()"><strong>8.1.</strong></a>
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<li>rem, <a href="#rem-unit" title=rem><strong>5.1.1.</strong></a>
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<li>renderer, <a href="#renderer" title=renderer><strong>8.5.</strong></a>
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<li>renderer, <a href="#renderer" title=renderer><strong>#</strong></a>
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<li>&lt;resolution>, <a href="#resolution-value"
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title="&lt;resolution>"><strong>6.4.</strong></a>
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<li>style sheet
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<ul>
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<li>as conformance class, <a href="#style-sheet"
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title="style sheet, as conformance class"><strong>8.5.</strong></a>
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title="style sheet, as conformance class"><strong>#</strong></a>
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</ul>
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<li>&lt;time>, <a href="#time-value"

‎css3-values/Overview.src.html‎

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Note this means that rounding errors <em>may</em> accumulate.
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-->
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<h2 id='iana'>
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Appendix A: IANA Considerations
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<h3 id='about-invalid'>
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Registration for the <code>about:invalid</code> URL scheme</h3>
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<p>
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This sections defines and registers the <code>about:invalid</code> URI,
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in accordance with the registration procedure defined in <a href="http://tools.ietf.org/html/draft-ietf-appsawg-about-uri-scheme-07">the about: uri scheme RFC draft</a>.
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<table>
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<tr>
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<th>Registered Token
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<td>invalid
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<tr>
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<th>Intended Usage
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<td>
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The <code>about:invalid</code> URI references a non-existent document with a generic error condition.
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It can be used when a URI is necessary, but the default value shouldn't be resolveable as any type of document.
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<tr>
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<th>Contact/Change controller
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<td>CSS WG &lt;<a href="mailto:www-style@w3.org">www-style@w3.org</a>> (on behalf of W3C)
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<tr>
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<th>Specification
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<td>CSS Values and Units Module Level 3
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</table>
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<h2 class="no-num" id="acknowledgments">Acknowledgments</h2>
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<p>Comments and suggestions from Giovanni Campagna, Christoph P&auml;per, Keith Rarick, Alex Mogilevsky, Ian Hickson, David Baron, Edward Welbourne, Boris Zbarsky, Bj&ouml;rn H&ouml;hrmann and Michael Day improved this module.
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<h2 class="no-num" id="conformance">
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Conformance</h2>
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<h3 class="no-num" id="conventions">
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Document conventions</h3>
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<p>Conformance requirements are expressed with a combination of
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<p class="note">Note, this is an informative note.</p>
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<h3 id="conformance-classes">
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<h3 class="no-num" id="conformance-classes">
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Conformance classes</h3>
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<p>Conformance to CSS Values and Units Level 3
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this module, and meet all other conformance requirements of style sheets
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<h3 class="no-num" id="partial">
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Partial implementations</h3>
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(as unsupported values must be), CSS requires that the entire declaration
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<h3 class="no-num" id="experimental">
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Experimental implementations</h3>
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in the draft.
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<h3 id="testing">
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<h3 class="no-num" id="testing">
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<p>Once a specification reaches the Candidate Recommendation stage,
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<a href="http://lists.w3.org/Archives/Public/public-css-testsuite">public-css-testsuite@w3.org</a>
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mailing list.
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<h3 class="no-num" id="cr-exit-criteria">
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CR exit criteria</h3>
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<p>

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