Fix button element type getter steps

Buttons in the Auto state that are submit buttons now return "submit" correctly.

Fixes #11046.

Author: lukewarlow

source

@@ -53794,12 +53794,17 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
   getter steps are:</p>
 
   <ol>
-   <li><p>Let <var>state</var> be <span>this</span>'s <code
-   data-x="attr-button-type">type</code> attribute.</p></li>
+   <li><p>If <var>this</var> is a <span data-x="concept-submit-button">submit button</span>, then
+   return "<code data-x="">submit</code>".</p></li>
+
+   <li><p>Let <var>state</var> be <span>this</span>'s <code data-x="attr-button-type">type</code>
+   attribute.</p></li>
+
+   <li><p><span>Assert</span>: <var>state</var> is not in the <span
+   data-x="attr-button-type-submit-state">Submit Button</span> state.</p></li>
 
    <li><p>If <var>state</var> is in the <span data-x="attr-button-type-auto-state">Auto</span>
-   state and <span>this</span> is not a <span data-x="concept-submit-button">submit button</span>,
-   then return "<code data-x="">button</code>".</p></li>
+   state, then return "<code data-x="">button</code>".</p></li>
 
    <li><p>Return the keyword value corresponding to <var>state</var>.</p></li>
   </ol>