resolve Issue #513

guidelines/sc/21/change-of-content.html

@@ -14,8 +14,7 @@ <h4>Change of Content</h4>
    </p>
 
    <ul>      						
-      <li>There is a programmatically determined relationship between the new content and the control
-         that triggers it;
+      <li>There is a programmatically determined relationship between the new content and the triggering mechanism;
       </li>						
       <li>The user has been advised of the change of content before or as a result of using the control;</li>
       <li>The change of content is not a result of a user action AND not related to the <a>primary purpose of the page</a>.

guidelines/sc/21/user-interface-component-contrast-minimum.html

@@ -27,9 +27,9 @@ <h4>User Interface Component Contrast (Minimum)</h4>
    </dl>
 	<div class="note">
    <ul>
-    <li>Examples of <a>essential</a> visual identifiers of <a>user interface components</a> may include (a border, edge, or icon), current value (such as non-text visual indication of aria-valuenow on a slider) and current state (such as selection indicator, focus indicator) or other essential visual indication (which do not rely on color alone).</li>
+    <li>Examples of visual identifiers of <a>user interface components</a> may include informative non-text content (a border, edge, or icon), current value (such as non-text visual indication of aria-valuenow on a slider) and current state (such as selection indicator, focus indicator) or other essential visual indication (which do not rely on color alone).</li>
    	<li>Under consideration: simplify this Success Criterion by setting the minimum color contrast requirement to 3:1 and removing any need for measuring thickness.</li>
     <li>Under consideration: will review to see if it is possible to combine with proposed WCAG 2.1 SC 1.4.11 Graphics Contrast.</li>
    </ul>
 	</div>
-</section>
+</section>