sync changes from #10960

source

@@ -53506,20 +53506,20 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
   data-x="invalid value default">invalid value default</i> are both the <span
   data-x="attr-button-type-submit-state">Submit Button</span> state.</p>
 
-  <p>If the <code data-x="attr-button-type">type</code> attribute is in the <span
-  data-x="attr-button-type-submit-state">Submit Button</span> state, and the <code
-  data-x="attr-button-type">type</code>, <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>
+  <p>An element is said to be a <span data-x="concept-submit-button">submit button</span> if any of
+  the following are true:</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, then the element is
-  specifically a <span data-x="concept-submit-button">submit button</span>.</p>
+  <ul>
+   <li><p>The <code data-x="attr-button-type">type</code> attribute is in the <span
+   data-x="attr-button-type-submit-state">Submit Button</span> state; or</p></li>
 
-  <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
-  <span data-x="attr-button-type-button-state">Button</span> state, the element is <span>barred from
-  constraint validation</span>.</p>
+   <li><p>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.</p></li>
+  </ul>
+
+  <p><strong>Constraint validation</strong>: If the element is not a <span
+  data-x="concept-submit-button">submit button</span>, the element is <span>barred from constraint
+  validation</span>.</p>
 
   <p>If specified, the <dfn element-attr for="button"><code
   data-x="attr-button-commandfor">commandfor</code></dfn> attribute value must be the <span
@@ -53590,12 +53590,13 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
 
    <li>
     <p>If <var>element</var> is a <span data-x="concept-submit-button">submit button</span>:</p>
-
     <ol>
+
      <li><p>If <var>element</var> has a <span>form owner</span> then <span
-     data-x="concept-form-submit">submit</span> <var>element</var>'s <span>form owner</span> from
-     <var>element</var> with <i data-x="submit-user-involvement">userInvolvement</i> set to
-     <var>event</var>'s <span data-x="event-uni">user navigation involvement</span>.</p></li>
+     data-x="concept-form-submit">Submit</span> <var>element</var>'s <span>form
+     owner</span> from <var>element</var> with <i
+     data-x="submit-user-involvement">userInvolvement</i> set to <var>event</var>'s <span
+     data-x="event-uni">user navigation involvement</span>.</p></li>
 
      <li><p>Return.</p></li>
     </ol>
@@ -53606,7 +53607,7 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
     data-x="attr-button-type-reset-state">Reset Button</span> state:</p>
 
     <ol>
-     <li><p>If <var>element</var> has a <span>form owner</span> then <span
+     <li><p>If <var>element</var> has a <span>form owner</span>, then <span
      data-x="concept-form-reset">Reset</span> <var>element</var>'s <span>form owner</span>.</p></li>
 
      <li><p>Return.</p></li>
@@ -53740,9 +53741,8 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
   data-x="attr-fs-formenctype">formenctype</code>, <code
   data-x="attr-fs-formmethod">formmethod</code>, <code
   data-x="attr-fs-formnovalidate">formnovalidate</code>, and <code
-  data-x="attr-fs-formtarget">formtarget</code> must not be specified if the element's <code
-  data-x="attr-button-type">type</code> attribute is not in the <span
-  data-x="attr-button-type-submit-state">Submit Button</span> state.</p>
+  data-x="attr-fs-formtarget">formtarget</code> must not be specified if the element is not a <code
+  data-x="concept-submit-button">submit button</code>.</p>
 
   <p>The <dfn attribute for="HTMLButtonElement"><code
   data-x="dom-button-commandForElement">commandForElement</code></dfn> IDL attribute must
@@ -53802,9 +53802,22 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
   <p>The <dfn attribute for="HTMLButtonElement"><code data-x="dom-button-value">value</code></dfn>
   IDL attribute must <span>reflect</span> the content attribute of the same name.</p>
 
-  <p>The <dfn attribute for="HTMLButtonElement"><code data-x="dom-button-type">type</code></dfn> IDL
-  attribute must <span>reflect</span> the content attribute of the same name, <span>limited to only
-  known values</span>.</p>
+  <p>The <dfn attribute for="HTMLButtonElement"><code data-x="dom-button-type">type</code></dfn>
+  getter steps are:</p>
+
+  <ol>
+   <li><p>If <span>this</span> is a <span data-x="concept-submit-button">submit button</span>, then
+   return "<code data-x="">submit</code>".</p></li>
+
+   <li><p>If <span>this</span>'s <span data-x="attr-button-type">type</span> attribute is in the
+   <span data-x="attr-button-type-reset-state">Reset</span> state, then return "<code
+   data-x="">reset</code>".</p></li>
+
+   <li><p>Return "<code data-x="">button</code>".</p></li>
+  </ol>
+
+  <p>The <code data-x="dom-button-type">type</code> setter steps are to set the <code
+  data-x="attr-button-type">type</code> content attribute to the given value.</p>
 
   <p>The <code data-x="dom-cva-willValidate">willValidate</code>, <code
   data-x="dom-cva-validity">validity</code>, and <code