[css-font-loading] Allow system fonts to return true in check().

Author: tabatkins

css-font-loading/Overview.bs

@@ -559,7 +559,8 @@ Events</h3>
 	If asked to <dfn export>find the matching font faces</dfn>
 	from a FontFaceSet <var>source</var>,
 	for a given font string <var>font</var>
-	and optionally some sample text <var>text</var>,
+	optionally some sample text <var>text</var>,
+	and optionally an <var>allow system fonts</var> flag,
 	run the following steps:
 
 	<ol>
@@ -579,6 +580,8 @@ Events</h3>
 
 		<li>
 			Let <var>available font faces</var> be the font faces within <var>source</var>.
+			If the <var>allow system fonts</var> flag is specified,
+			add all system fonts to <var>available font faces</var>.
 
 		<li>
 			Let <var>matched font faces</var> initially be an empty list.
@@ -684,6 +687,7 @@ The <code>check()</code> method</h3>
 		<li>
 			<a>Find the matching font faces</a> from <var>font face set</var>
 			using the <a argument for="FontFaceSet/check()">font</a> and <a argument for="FontFaceSet/check()">text</a> arguments passed to the function,
+			and including system fonts,
 			and let <var>font face list</var> be the return value.
 			If a syntax error was returned,
 			throw a SyntaxError exception
@@ -695,6 +699,7 @@ The <code>check()</code> method</h3>
 
 		<li>
 			If all fonts in the <var>font face list</var> have a <a attribute for=FontFace>status</a> attribute of "loaded",
+			or are system fonts,
 			return <code>true</code>.
 			Otherwise, return <code>false</code>.
 	</ol>

css-font-loading/Overview.html

@@ -614,7 +614,8 @@ <h3 class="heading settled heading" data-level=3.2 id=FontFaceSet-events><span c
 <p>If asked to <dfn data-dfn-type=dfn data-export="" id=find-the-matching-font-faces>find the matching font faces<a class=self-link href=#find-the-matching-font-faces></a></dfn>
 	from a FontFaceSet <var>source</var>,
 	for a given font string <var>font</var>
-	and optionally some sample text <var>text</var>,
+	optionally some sample text <var>text</var>,
+	and optionally an <var>allow system fonts</var> flag,
 	run the following steps:</p>
 
 	<ol>
@@ -634,6 +635,8 @@ <h3 class="heading settled heading" data-level=3.2 id=FontFaceSet-events><span c
 
 		<li>
 			Let <var>available font faces</var> be the font faces within <var>source</var>.
+			If the <var>allow system fonts</var> flag is specified,
+			add all system fonts to <var>available font faces</var>.
 
 		<li>
 			Let <var>matched font faces</var> initially be an empty list.
@@ -723,6 +726,7 @@ <h3 class="heading settled heading" data-level=3.4 id=font-face-set-check><span
 		<li>
 			<a data-link-type=dfn href=#find-the-matching-font-faces title="find the matching font faces">Find the matching font faces</a> from <var>font face set</var>
 			using the <a class=idl-code data-link-for=FontFaceSet/check() data-link-type=argument href=#dom-fontfacesetcheck-font title=font>font</a> and <a class=idl-code data-link-for=FontFaceSet/check() data-link-type=argument href=#dom-fontfacesetcheck-text title=text>text</a> arguments passed to the function,
+			and including system fonts,
 			and let <var>font face list</var> be the return value.
 			If a syntax error was returned,
 			throw a SyntaxError exception
@@ -734,6 +738,7 @@ <h3 class="heading settled heading" data-level=3.4 id=font-face-set-check><span
 
 		<li>
 			If all fonts in the <var>font face list</var> have a <a class=idl-code data-link-for=FontFace data-link-type=attribute href=#dom-fontface-status title=status>status</a> attribute of "loaded",
+			or are system fonts,
 			return <code>true</code>.
 			Otherwise, return <code>false</code>.
 	</ol>