Update understanding/22/target-size-minimum.html

Co-authored-by: gundulaniemann <[email protected]>

understanding/22/target-size-minimum.html

@@ -137,7 +137,7 @@ <h3>Spacing</h3>
 
         <section>
             <h3>User agent control</h3>
-            <p>This Success Criterion has an exception for the size of targets determined by a user agent and not modified by the author. An example of this kind of target is a browser's scrollbars. If a scrollbar has been modified by the author then there must be a passing amount of spacing between the scrollbar and the content of the page. The following example shows a passing and a failing design.</p>
+            <p>This Success Criterion has an exception for the size of targets determined by a user agent and not modified by the author. An example of this kind of target is a browser's scrollbars. If a scrollbar's dimensions have been modified by the author then there must be a passing amount of spacing between the scrollbar and the content of the page. The following example shows a passing and a failing design.</p>
             <figure id="target-browser-scrollbars">
                 <img height="100" src="img/target-custom-scrollbar-spacing.svg" width="300">
                 <figcaption>A page's scrollbar has been modified to give it custom track and thumb colors. The track is less than 24px wide and the thumb is narrower. The page has a "back to top" link that is next to the scrollbar. The passing example has enough space between the link and the scrollbar for a 24 CSS pixel diameter circle, placed over the scrollbar, to not overlap the link. The failing example has no space between the link and the scrollbar, which fails the criterion because the 24 CSS pixel diameter circle overlaps the link. (Image shown to scale - <a href="img/target-custom-scrollbar-spacing.svg">see the scalable original version</a>)</figcaption>