[css-fonts-4] Add initial text for font-min-size and font-max-size

Author: litherum

css-fonts-4/Overview.bs

@@ -679,6 +679,45 @@ at least as dark as its predecessor. Only values between 1 - 999 are valid, and
 	</pre>
 	</div>
 
+<h3 id="font-min-max-size-prop">Minimum and maximum font size: the 'font-min-size' and 'font-max-size' properties</h3>
+
+	<pre class="propdef">
+	Name: font-min-size
+	Value: <<absolute-size>> | <<relative-size>> | <<length-percentage>>
+	Initial: 0px
+	Applies to: all elements
+	Inherited: yes
+	Percentages: refer to parent element's font size
+	Computed value: absolute length
+	Media: visual
+	Animatable: As <<length>>
+	</pre>
+
+	<pre class="propdef">
+	Name: font-max-size
+	Value: <<absolute-size>> | <<relative-size>> | <<length-percentage>> | infinity
+	Initial: infinity
+	Applies to: all elements
+	Inherited: yes
+	Percentages: refer to parent element's font size
+	Computed value: absolute length
+	Media: visual
+	Animatable: As <<length>>
+	</pre>
+
+	These two properties allow a website or user to require an element's font size to be clamped within the range
+	supplied with these two properties. If the computed value 'font-size' is outside the bounds created by 'font-min-size'
+	and 'font-max-size', the use value of 'font-size' is clamped to the values specified in these two properties.
+
+	Some user agents provide a nonstandard mapping between the computed value of 'font-size' and the used value of 'font-size'.
+	The interaction of those nonstandard algorithms with 'font-min-size' or 'font-max-size' is explicitly undefined.
+
+	If the 'font-min-size' property is computed to be larger than the 'font-max-size' property, then the two properties are ignored.
+
+	Users with accessibility preferences may set this in a user-agent style sheet to force websites' text to become larger.
+
+	These two properties have no effect on the computed value of 'font-size'.
+
 <h3 id="font-size-adjust-prop">Relative sizing: the 'font-size-adjust' property</h3>
 
 	TODO: Migrate this from level 3.
@@ -1753,11 +1792,6 @@ at least as dark as its predecessor. Only values between 1 - 999 are valid, and
 
     Issue: Import from level 3
 
-<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 id="emoji-fallback">Font fallback for emoji codepoints</h2>
 
 <p>Many codepoints supported by emoji fonts overlap with codepoints supported