[css-nav-1] Fix errors from HTML validator

Author: Jihye Hong

css-nav-1/Overview.bs

@@ -1024,10 +1024,10 @@ To run the <dfn>spatial navigation steps</dfn> in <var>direction</var>, do the f
         set <var>eventTarget</var> be <a>the body element</a> if it is not <code>null</code>
         or to the <a>document element</a> otherwise.
 4.  <ul>
-        <span class=cssapi><li>If <var>eventTarget</var> is <a>scroll container</a>
+        <li class=cssapi>If <var>eventTarget</var> is <a>scroll container</a>
             and the computed value of the 'spatial-navigation-action' property on <var>eventTarget</var> is ''spatial-navigation-action/scroll''
             and <var>eventTarget</var> [=can be manually scrolled=],
-            then [=directionally scroll the element=] <var>eventTarget</var> and return.</li></span>
+            then [=directionally scroll the element=] <var>eventTarget</var> and return.</li>
         <li><span class=cssapi>Else,</span> if <var>eventTarget</var> is either a <a>scroll container</a> or the <a>document</a>
             1. Let <var>candidates</var> be the result of <a>finding focusable areas</a>
                 within <var>eventTarget</var>
@@ -1037,16 +1037,14 @@ To run the <dfn>spatial navigation steps</dfn> in <var>direction</var>, do the f
                 </span>
             2.
                 <ul>
-                    <span class=cssapi><li>If
+                    <li class=cssapi>If
                         the computed value of the 'spatial-navigation-action' property on <var>eventTarget</var> is not ''spatial-navigation-action/focus''
                         and <var>eventTarget</var> <a>can be manually scrolled</a>,
-                        then <a>directionally scroll the element</a> <var>eventTarget</var> in <var>direction</var> and return.</li></span>
+                        then <a>directionally scroll the element</a> <var>eventTarget</var> in <var>direction</var> and return.</li>
                     <li><span class=cssapi>Else </span>if <var>candidates</var> contains at least 1 item:
                         1. Let <var>bestCandidate</var> be the result of <a>selecting the best candidate</a>
                             within <var>candidates</var> in <var>direction</var> starting from <var>searchOrigin</var>
-                                <p class=api>
                         2. <a>Dispatches navbeforefocus event</a> at <var>eventTarget</var> with <var>direction</var> and <var>bestCandidate</var>.
-                                </p>
                         3. Run the <a>focusing steps</a> for <var>bestCandidate</var> and return
                     </li>
                     <li>Else, fall back to the next step.</li>
@@ -1064,12 +1062,11 @@ To run the <dfn>spatial navigation steps</dfn> in <var>direction</var>, do the f
     excluding <var>eventTarget</var>
     </span>
 7. If <var>candidates</var> is empty:
-    <ul>
-        <span class=cssapi><li>If the computed value of the 'spatial-navigation-action' property on <var>container</var> is not ''spatial-navigation-action/focus''
+        <li class=cssapi>If the computed value of the 'spatial-navigation-action' property on <var>container</var> is not ''spatial-navigation-action/focus''
             and <var>container</var> is a <a>scroll container</a> that <a>can be manually scrolled</a>,
             <a>directionally scroll the element</a> <var>container</var> in <var>direction</var> and return.
-        </li></span>
-        <span class=cssapi><li>Else,</li></span>
+        </li>
+        <li class=cssapi>Else,</li>
             1. <a>Dispatches navnotarget event</a> at <var>eventTarget</var> with <var>direction</var> and <var>container</var>.
             2.
                 * If <var>container</var> is the <a>document element</a> of the <a>top-level browsing context</a>,
@@ -1087,7 +1084,6 @@ To run the <dfn>spatial navigation steps</dfn> in <var>direction</var>, do the f
     within <var>candidates</var> in <var>direction</var> starting from <var>eventTarget</var>.
 9. <a>Dispatches navbeforefocus event</a> at <var>eventTarget</var> with <var>direction</var> and <var>bestCandidate</var>.
 10. Run the <a>focusing steps</a> for <var>bestCandidate</var> and return.
-
 </div>
 
 <h3 id=heuristics>