[css-fonts-4] add in a rough skeleton of CSS4 Fonts changes

Author: John Daggett

css-fonts-4/Overview.bs

@@ -1,27 +1,27 @@
 <pre class='metadata'>
 Title: CSS Fonts Module Level 4
 Shortname: css-fonts
-Level: 1
+Level: 4
 Status: ED
 Work Status: Exploring
 Group: CSSWG
 ED: https://dev.w3.org/csswg/css-fonts-4/
-No Editor: true
-Abstract: This is a delta spec over <a href="https://dev.w3.org/csswg/css-fonts-3/">CSS Fonts 3</a>, to hold issues on things we've resolved to add. It's not currently a usable spec.
-Warning: not ready
+Editor: John Daggett, Mozilla, jdaggett@mozilla.com
+Abstract: This specification defines modifications to the existing <a href="https://dev.w3.org/csswg/css-fonts-3/">CSS Fonts 3</a> specification along with additional experimental features.
 Ignored Terms: font-palette, <named-palette-color>
 </pre>
 
 <pre class="link-defaults">
 spec:css-color-4; type:property; text:color
 </pre>
 
-Introduction {#intro}
-=====================
+<h2 id="introduction">Introduction</h2>
 
-Intro goes here.
+<p></p>
 
-<div class="issue">
+<h2 id="font-palette-control">Controlling font palette colors</h2>
+
+<div>
 	Resolved at 2015 Sydney to add font-palette control.
 	<a href="https://lists.w3.org/Archives/Public/www-style/2015Feb/0211.html">Original proposal</a>.
 
@@ -50,3 +50,21 @@ Intro goes here.
 		If a palette color name occurs more than once, the last one wins
 		(so you can declare a palette in a variable, and override bits as desired).
 </div>
+
+<h2 id="expanded-font-weight-scale">Expanding the scale of <code>font-weight</code></h2>
+
+<p>Expand the range of weights possible within the <code>font-weight</code>
+property and <code>font-weight</code> descriptor to include integer values within
+the range [1..999].</p>
+
+<h2 id="system-generic-font">The <code>system</code> generic font</h2>
+
+<p>Define a new <code>system</code> generic font that maps to the default user
+interface font used on a given system.</p>
+
+<h2 id="min-max-font-size">Minimum and maximum <code>font-size</code></h2>
+
+<p>Define new properties to control the minimum and maximum font-size,
+<code>min-font-size</code> and <code>max-font-size</code>.</p>
+
+<h2 class="no-num" id="acknowledgments">Acknowledgments</h2>