Replace Media:all in propdef tables with prose

Closes #2413

Author: frivoal

css-contain-1/Overview.bs

@@ -61,11 +61,12 @@ Strong Containment: the 'contain' property</h2>
 		Initial: none
 		Inherited: no
 		Applies to: all elements
-		Media: all
 		Computed value: specified value
 		Animation type: not animatable
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 	The 'contain' property allows an author to indicate that an element and its contents are,
 	as much as possible,
 	<em>independent</em> of the rest of the document tree.

css-content-3/Overview.bs

@@ -92,9 +92,9 @@ Inserting and replacing content with the 'content' property</h2>
 		Inherited: no
 		Percentages: n/a
 		Computed Value: As specified below
-		Media: all
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
 
 	The 'content' property dictates what is rendered inside an element or pseudo-element.
 
@@ -384,9 +384,10 @@ Specifying quotes with the 'quotes' property</h4>
 		Inherited: yes
 		Percentages: n/a
 		Computed Value: specified value
-		Media: all
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 	Issue: The previous ED had an initial value of ''text'',
 	which was an error.
 	[[CSS21]] has initial value of "depends on user agent".
@@ -944,10 +945,11 @@ The string-set property</h4>
 	Applies to: all elements, but not pseudo-elements
 	Inherited: no
 	Percentages: N/A
-	Media: all
 	Computed value: specified value
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 	The 'string-set' property copies the text content of an element into a ''named string'',
 	which functions as a variable.
 	The text content of this named string can be retrieved using the ''string()'' function.

css-display-3/Overview.bs

@@ -166,9 +166,10 @@ Box Layout Modes: the 'display' property</h2>
 	Inherited: no
 	Computed value: see prose in a variety of specs
 	Animatable: no
-	Media: all
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 	The 'display' property defines an element's <dfn export>display type</dfn>,
 	which consists of the two basic qualities of how an element generates boxes:
 
@@ -707,9 +708,10 @@ Toggling Box Generation: the 'display-or-not' property</h2>
 	Inherited: no
 	Percentages: n/a
 	Computed value: as specified
-	Media: all
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 	The ''display: none'' value was historically used as a "toggle"
 	to switch between showing and hiding an element.
 	Making this reversible requires either setting up the CSS <a>cascade</a> carefully,

css-gcpm-3/Overview.bs

@@ -51,10 +51,10 @@ Initial: none
 Applies to: all elements, but not pseudo-elements
 Inherited: no
 Percentages: N/A
-Media: all
 Computed value: specified value
 </pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
 
 The 'string-set' property contains one or more pairs, each consisting of an custom identifier (the name of the named string) followed by a ''content-list'' describing how to construct the value of the named string.
 
@@ -335,10 +335,11 @@ Initial: none
 Applies to: elements
 Inherited: no
 Percentages: N/A
-Media: all
 Computed value: specified value
 </pre>
 
+<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 </div>
 
 <h4 id="element-syntax">

css-lists-3/Overview.bs

@@ -780,10 +780,11 @@ Manipulating Counters: the 'counter-increment', 'counter-set' and 'counter-reset
 	Applies to: all elements
 	Inherited: no
 	Percentages: n/a
-	Media: all
 	Computed value: specified value
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 	The 'counter-reset' property <a lt="create a new counter">creates new counters</a> on an element.
 	Its values are defined as follows:
 
@@ -815,21 +816,23 @@ Manipulating Counters: the 'counter-increment', 'counter-set' and 'counter-reset
 	Applies to: all elements
 	Inherited: no
 	Percentages: n/a
-	Media: all
 	Computed value: specified value
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 	<pre class='propdef'>
 	Name: counter-increment
 	Value: [ <<custom-ident>> <<integer>>? ]+ | none
 	Initial: none
 	Applies to: all elements
 	Inherited: no
 	Percentages: n/a
-	Media: all
 	Computed value: specified value
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 	The 'counter-set' and 'counter-increment' properties
 	manipulate the value of existing counters.
 	They only create new counters if there is no counter of the given name on the element yet.

css-preslev-1/Overview.html

@@ -273,12 +273,6 @@ <h2 id="presentation-level-property"><span class="secno">2. </span>The
      <td>N/A</td>
     </tr>
 
-    <tr>
-     <td><em>Media:</em></td>
-
-     <td>all</td>
-    </tr>
-
     <tr>
      <td><em>Computed value:</em></td>
 
@@ -287,6 +281,8 @@ <h2 id="presentation-level-property"><span class="secno">2. </span>The
    </tbody>
   </table>
 
+  <p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
   <p>This property sets the element's presentation level (EPL). The values
    have the following meanings:</p>
 

css-preslev-1/Overview.src.html

@@ -181,17 +181,14 @@ <h2 id="presentation-level-property">The 'presentation-level' property</h2>
 <td>N/A</td>
 </tr>
 
-<tr>
-<td><em>Media:</em></td>
-<td>all</td>
-</tr>
-
 <tr>
 <td><em>Computed&nbsp;value:</em></td>
 <td>integer</td>
 </tr>
 </table>
 
+<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 <p>This property sets the element's presentation level (EPL). The
 values have the following meanings:</p>
 

css-variables-1/Overview.bs

@@ -63,10 +63,11 @@ Defining Custom Properties: the '--*' family of properties</h2>
 	Applies to: all elements
 	Inherited: yes
 	Computed value: specified value with variables substituted (but see prose for "invalid variables")
-	Media: all
 	Animatable: no
 	</pre>
 
+	<p class=all-media>User Agents are expected to support this property on all media, including non-visual ones.</p>
+
 	A <dfn export>custom property</dfn> is any property
 	whose name starts with two dashes (U+002D HYPHEN-MINUS),
 	like '--foo'.