Correct attribute index for empty string values

A number of enumerated attributes accept the empty string as value (those with an "empty value default"), but the attribute index did not acknowledge this.

(Credit: Mike(tm) Smith.)

Author: annevk

source

@@ -152731,7 +152731,8 @@ interface <dfn interface>External</dfn> {
      <td> <span data-x="attr-autocorrect">HTML elements</span>
      <td> Recommended autocorrection behavior (for supported input methods)
      <td> "<code data-x="attr-autocorrect-on">on</code>";
-          "<code data-x="attr-autocorrect-off">off</code>"
+          "<code data-x="attr-autocorrect-off">off</code>";
+          the empty string
     <tr>
      <th> <code data-x="">autofocus</code>
      <td> <span data-x="attr-fe-autofocus">HTML elements</span>
@@ -152827,8 +152828,10 @@ interface <dfn interface>External</dfn> {
      <th> <code data-x="">contenteditable</code>
      <td> <span data-x="attr-contenteditable">HTML elements</span>
      <td> Whether the element is editable
-     <td> "<code data-x="">true</code>"; "<code data-x="">plaintext-only</code>";
-          "<code data-x="">false</code>"
+     <td> "<code data-x="">true</code>";
+          "<code data-x="">false</code>";
+          "<code data-x="">plaintext-only</code>";
+          the empty string
     <tr>
      <th> <code data-x="">controls</code>
      <td> <code data-x="attr-media-controls">audio</code>;
@@ -152848,7 +152851,9 @@ interface <dfn interface>External</dfn> {
           <code data-x="attr-script-crossorigin">script</code>;
           <code data-x="attr-media-crossorigin">video</code>
      <td> How the element handles crossorigin requests
-     <td> "<code data-x="attr-crossorigin-anonymous-keyword">anonymous</code>"; "<code data-x="attr-crossorigin-use-credentials-keyword">use-credentials</code>"
+     <td> "<code data-x="attr-crossorigin-anonymous-keyword">anonymous</code>";
+          "<code data-x="attr-crossorigin-use-credentials-keyword">use-credentials</code>";
+          the empty string
     <tr>
      <th> <code data-x="">data</code>
      <td> <code data-x="attr-object-data">object</code>
@@ -153356,7 +153361,8 @@ interface <dfn interface>External</dfn> {
      <td> Makes the element a <span data-x="attr-popover">popover</span> element
      <td> "<code data-x="attr-popover-auto">auto</code>";
           "<code data-x="attr-popover-manual">manual</code>";
-          "<code data-x="attr-popover-hint">hint</code>"
+          "<code data-x="attr-popover-hint">hint</code>";
+          the empty string
     <tr>
      <th> <code data-x="">popovertarget</code>
      <td> <code data-x="attr-popovertarget">button</code>;
@@ -153383,7 +153389,8 @@ interface <dfn interface>External</dfn> {
      <td> Hints how much buffering the <span>media resource</span> will likely need
      <td> "<code data-x="attr-media-preload-none">none</code>";
           "<code data-x="attr-media-preload-metadata">metadata</code>";
-          "<code data-x="attr-media-preload-auto">auto</code>"
+          "<code data-x="attr-media-preload-auto">auto</code>";
+          the empty string
     <tr>
      <th> <code data-x="">readonly</code>
      <td> <code data-x="attr-input-readonly">input</code>;
@@ -153642,7 +153649,7 @@ interface <dfn interface>External</dfn> {
      <th> <code data-x="">translate</code>
      <td> <span data-x="attr-translate">HTML elements</span>
      <td> Whether the element is to be translated when the page is localized
-     <td> "<code data-x="">yes</code>"; "<code data-x="">no</code>"
+     <td> "<code data-x="">yes</code>"; "<code data-x="">no</code>"; the empty string
     <tr>
      <th> <code data-x="">type</code>
      <td> <code data-x="attr-hyperlink-type">a</code>;