fix implicit submit/commandfor button logic

source

@@ -53483,10 +53483,8 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
   the element is specifically a <span data-x="concept-submit-button">submit button</span>.</p>
 
   <p>If the <code data-x="attr-button-type">type</code> content attribute is present and in the
-  <span data-x="attr-button-type-submit-state">Submit Button</span> state, and the <code
-  data-x="attr-button-command">command</code> and <code
-  data-x="attr-button-commandfor">commandfor</code> content attributes are not present, then the
-  element is specifically a <span data-x="concept-submit-button">submit button</span>.</p>
+  <span data-x="attr-button-type-submit-state">Submit Button</span> state, then the element is
+  specifically a <span data-x="concept-submit-button">submit button</span>.</p>
 
   <p><strong>Constraint validation</strong>: If the <code data-x="attr-button-type">type</code>
   attribute is in the <span data-x="attr-button-type-reset-state">Reset Button</span> state or the
@@ -53593,6 +53591,10 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
     <p>If <var>invokee</var> is not null:</p>
 
     <ol>
+     <li><p>If <var>element</var> has a <span>form owner</span> and <var>element</var>'s <code
+     data-x="attr-button-type">type</code> attribute is in the <span
+     data-x="attr-button-type-submit-state">Submit Button</span> state, then return.</p>
+
      <li><p>Let <var>command</var> be <var>element</var>'s <code
      data-x="attr-button-command">command</code> attribute value.</li>