[css-ui-3] Make non intrinsically sized SVG support optional

Closes #1813

Author: frivoal

css-ui/Overview.bs

@@ -960,21 +960,26 @@ Conforming User Agents may, instead of <<url>>, support <<image>> which is a sup
 The UA must support the following image file formats:
 <ul>
 	<li>PNG, as defined in [[!PNG]]
-	<li>SVG, as defined in [[!SVG11]], in <a href="https://www.w3.org/TR/SVG2/conform.html#secure-static-mode">secure static mode</a> [[!SVG2]]
+	<li>SVG, as defined in [[!SVG11]], in <a href="https://www.w3.org/TR/SVG2/conform.html#secure-static-mode">secure static mode</a> [[!SVG2]], if it has an intrinsic size.
 	<li>any other non-animated image file format that they support
 	for <<image>> in other properties,
 	such as the the 'background-image' property
 </ul>
 
 In addition, the UA should support the following image file formats:
 <ul>
-	<li>SVG, as defined in [[!SVG11]], in <a href="https://www.w3.org/TR/SVG2/conform.html#secure-animated-mode">secure animated mode</a> [[!SVG2]]
+	<li>SVG, as defined in [[!SVG11]], in <a href="https://www.w3.org/TR/SVG2/conform.html#secure-animated-mode">secure animated mode</a> [[!SVG2]], if it has an intrinsic size.
 	<li>any other animated image file format that they support
 	for <<image>> in other properties,
 	such as the the 'background-image' property
 </ul>
 
-The UA may also support additional file formats.
+The UA may also support additional file formats, including SVG, as defined in [[!SVG11]], in secure static mode or secure animated mode [[!SVG2]], even if it does not have an intrinsic size.
+
+Note: The CSS Working group initially indented support for all SVG,
+intrinsically sized or not.
+Support for non intrinsically sized SVG was downgraded from mandatory to optional due
+to lack of implementations.
 
 Note: At the time of writing this specification (spring 2015),
 the only file formats supported for cursors in common desktop browsers are
@@ -1376,6 +1381,7 @@ This appendix describes changes from the
 	<li>Add informative link to HTML about special handling of 'cursor' over image maps
 	<li>Clarify (as a SHOULD) the implications of text-overflow on pointer events to capture implementor consensus.
 	<li>Clarify that UAs may ignore the cursor property to reflect the UA's UI state
+	<li>Allow, but stop requiring support for SVG images without intrinsic sizes for cursors
 </ul>
 
 <h2 class="no-num" id="security-privacy-considerations">Appendix C. Considerations for Security and Privacy</h2>

css-ui/issues-2017-2.txt

@@ -65,3 +65,12 @@ Comment:  https://github.com/w3c/csswg-drafts/issues/1691
 Response: https://github.com/w3c/csswg-drafts/issues/1691#issuecomment-323391476
 Closed:   Accepted
 Resolved: https://github.com/w3c/csswg-drafts/issues/1691#issuecomment-324391129
+----
+Issue 9.
+Summary:  Stop mandating support for non fixed size SVG as cursors
+From:     Florian Rivoal
+Comment:  https://github.com/w3c/csswg-drafts/issues/1813
+Comment:  https://github.com/w3c/csswg-drafts/issues/1813#issuecomment-329298504
+Comment:  https://github.com/w3c/csswg-drafts/issues/1813#issuecomment-329701978
+Resolved: https://github.com/w3c/csswg-drafts/issues/1813#issuecomment-330912545
+Closed:   Accepted