[css-fonts] Move CSSFontFaceRule attributes to Level 4

Per #825 (comment)

Author: SimonSapin

css-fonts-4/Overview.bs

@@ -2686,6 +2686,31 @@ at least as dark as its predecessor. Only values greater than 0 and less than 10
 	</pre>
 	</div>
 
+<h2 id="object-model">Object Model</h2>
+
+	The contents of <code>@font-face</code> rules can be accessed via
+	the following extensions to the CSS Object Model.
+
+<h3 id="om-fontface">The <code>CSSFontFaceRule</code> interface</h3>
+
+	The <dfn>CSSFontFaceRule</dfn> interface represents a <<@font-face>> rule.
+
+	<pre class="idl">
+	interface CSSFontFaceRule : CSSRule {
+	  attribute DOMString family;
+	  attribute DOMString src;
+	  attribute DOMString style;
+	  attribute DOMString weight;
+	  attribute DOMString stretch;
+	  attribute DOMString unicodeRange;
+	  attribute DOMString variant;
+	  attribute DOMString featureSettings;
+	};</pre>
+
+	The DOM Level 2 Style specification [[DOM-LEVEL-2-STYLE]] defined
+	a different variant of this rule.
+	This definition supercedes that one.
+
 <h2 id="platform-props-to-css" class="no-num">Appendix A: Mapping platform font properties to CSS properties</h2>
 
     Issue: Import from level 3

css-fonts/Fonts.html

@@ -6005,20 +6005,18 @@ <h3 id=om-fontface><span class=secno>8.1. </span>The <a
 
   <pre class=idl>
 interface CSSFontFaceRule : CSSRule {
-  attribute DOMString family;
-  attribute DOMString src;
-  attribute DOMString style;
-  attribute DOMString weight;
-  attribute DOMString stretch;
-  attribute DOMString unicodeRange;
-  attribute DOMString variant;
-  attribute DOMString featureSettings;
+  // Intentionally left blank in this specification.
 }</pre>
 
-  <p>The DOM Level 2 Style specification <a href="#ref-DOM-LEVEL-2-STYLE"
-   rel=biblioentry>[DOM-LEVEL-2-STYLE]<!--{{DOM-LEVEL-2-STYLE}}--></a>
-   defined a different variant of this rule. This definition supercedes that
-   one.
+  <p class=note>The CSS Working Group would like <a
+   href="#cssfontfacerule"><code>CSSFontFaceRule</code></a> to have one
+   attribute for each <a
+   href="#at-font-face-rule"><code>@font-face</code></a> descriptor, <a
+   href="../css-fonts-4/#om-fontface">as specified in CSS Fonts Level 4</a>.
+   As of this writing however, no implementation implements these attributes
+   and instead implement the <code>style</code> attribute defined in the DOM
+   Level 2 Style specification <a href="#ref-DOM-LEVEL-2-STYLE"
+   rel=biblioentry>[DOM-LEVEL-2-STYLE]<!--{{DOM-LEVEL-2-STYLE}}--></a>.
 
   <h3 id=om-fontfeaturevalues><span class=secno>8.2. </span>The <a
    href="#cssfontfeaturevaluesrule"><code>CSSFontFeatureValuesRule</code></a>

css-fonts/Fonts.src.html

@@ -4469,17 +4469,15 @@ <h3 id="om-fontface">The <code>CSSFontFaceRule</code> interface</h3>
 
 <pre class="idl">
 interface CSSFontFaceRule : CSSRule {
-  attribute DOMString family;
-  attribute DOMString src;
-  attribute DOMString style;
-  attribute DOMString weight;
-  attribute DOMString stretch;
-  attribute DOMString unicodeRange;
-  attribute DOMString variant;
-  attribute DOMString featureSettings;
+  // Intentionally left blank in this specification.
 }</pre>
 
-<p>The DOM Level 2 Style specification [[DOM-LEVEL-2-STYLE]] defined a different variant of this rule.  This definition supercedes that one.</p>
+<p class="note">The CSS Working Group would like <code>CSSFontFaceRule</code> to have
+one attribute for each <code>@font-face</code> descriptor,
+<a href="../css-fonts-4/#om-fontface">as specified in CSS Fonts Level 4</a>.
+As of this writing however, no implementation implements these attributes
+and instead implement the <code>style</code> attribute defined in
+the DOM Level 2 Style specification [[DOM-LEVEL-2-STYLE]].
 
 <h3 id="om-fontfeaturevalues">The <code>CSSFontFeatureValuesRule</code> interface</h3>