Add mark role (#1133)

* Add mark role
Co-Authored-By: Carolyn MacLeod <[email protected]>

index.html

@@ -656,6 +656,7 @@ <h3>Document Structure Roles</h3>
 				<li><rref>legend</rref></li>
 				<li><rref>list</rref></li>
 				<li><rref>listitem</rref></li>
+				<li><rref>mark</rref></li>
 				<li><rref>math</rref></li>
 				<li><rref>meter</rref></li>
 				<li><rref>none</rref></li>
@@ -4832,6 +4833,94 @@ <h2>Definition of Roles</h2>
 				</tbody>
 			</table>
 		</div>
+		<div class="role" id="mark">
+			<rdef>mark</rdef>
+			<div class="role-description">
+				<p>Content which is marked or highlighted for reference or notation purposes, due to the content's relevance in the enclosing context.</p>
+				<p>Example uses for <code>mark</code> include:</p>
+				<ul>
+					<li>Highlighting text in a quotation which is of special interest but is not marked in the original source material, comparable to using a highlighter pen to mark passages of a print article.</li>
+					<li>Indicating portions of the content that are relevant to the user's current activity, such as highlighting text matches found by a search feature.</li>
+				</ul>
+				<p>Authors SHOULD NOT use <code>mark</code> for purely decorative styling such as syntax highlighting.</p>
+			</div>
+			<table class="role-features">
+				<caption>Characteristics:</caption>
+				<thead>
+					<tr>
+						<th scope="col">Characteristic</th>
+						<th scope="col">Value</th>
+					</tr>
+				</thead>
+				<tbody>
+					<tr>
+						<th class="role-abstract-head" scope="row">Is Abstract:</th>
+						<td class="role-abstract"> </td>
+					</tr>
+					<tr>
+						<th class="role-parent-head" scope="row">Superclass Role:</th>
+						<td class="role-parent"><rref>section</rref></td>
+					</tr>
+					<tr>
+						<th class="role-base-head" scope="row">Base Concept:</th>
+						<td class="role-base"> </td>
+					</tr>
+					<tr>
+						<th class="role-related-head" scope="row">Related Concepts:</th>
+						<td class="role-related"><code>&lt;mark&gt;</code> in [[HTML]]</td>
+					</tr>
+					<tr>
+						<th class="role-scope-head" scope="row">Required Context Role:</th>
+						<td class="role-scope"> </td>
+					</tr>
+					<tr>
+						<th class="role-mustcontain-head" scope="row">Required Owned Elements:</th>
+						<td class="role-mustcontain"> </td>
+					</tr>
+					<tr>
+						<th class="role-required-properties-head">Required States and Properties:</th>
+						<td class="role-required-properties"> </td>
+					</tr>
+					<tr>
+						<th class="role-properties-head" scope="row">Supported States and Properties:</th>
+						<td class="role-properties"> </td>
+					</tr>
+					<tr>
+						<th class="role-inherited-head" scope="row">Inherited States and Properties:</th>
+						<td class="role-inherited">Placeholder</td>
+					</tr>
+					<tr>
+						<th class="role-disallowed-head" scope="row">Prohibited States and Properties:</th>
+						<td class="role-disallowed">
+							<ul>
+								<li><pref>aria-label</pref></li>
+								<li><pref>aria-labelledby</pref></li>
+							</ul>									 
+						</td>
+					</tr>													 
+					<tr>
+						<th class="role-namefrom-head" scope="row">Name From:</th>
+						<td class="role-namefrom">prohibited</td>
+					</tr>
+					<tr>
+						<th class="role-namerequired-head" scope="row">Accessible Name Required:</th>
+						<td class="role-namerequired"> </td>
+					</tr>
+					<tr>
+						<th class="role-namerequired-inherited-head" scope="row">Inherits Name Required:</th>
+						<td class="role-namerequired-inherited"> </td>
+					</tr>
+					<tr>
+						<th class="role-childpresentational-head" scope="row">Children Presentational:</th>
+						<td class="role-childpresentational"> </td>
+					</tr>
+					<tr>
+						<th class="role-presentational-inherited-head" scope="row">Inherits Presentational:</th>
+						<td class="role-presentational-inherited"> </td>
+					</tr>
+				</tbody>
+			</table>
+		</div>
 		<div class="role" id="marquee">
 			<rdef>marquee</rdef>
 			<div class="role-description">