Add PUT, PATCH, and DELETE to form method attribute

Resolves: whatwg#3577

This adds `put`, `patch`, and `delete` values to the form element's
`method` attribute, and alters navigation to properly handle those
additional HTTP methods. It relies on a corresponding change to fetch
spec, which allows `mode=navigate` fetches to make CORS requests
([fetch spec PR whatwg#1785](whatwg/fetch#1785)).

Author: alexpetros

source

@@ -2534,6 +2534,8 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
     <p>The following terms are defined in the HTTP specifications: <ref>HTTP</ref></p>
 
     <ul class="brief">
+     <li><dfn data-x="http-method" data-x-href="https://httpwg.org/specs/rfc7231.html#methods">method</dfn></li>
+     <li><dfn data-x="http-idempotent-method" data-x-href="https://httpwg.org/specs/rfc7231.html#idempotent.methods">idempotent method</dfn></li>
      <li>`<dfn data-x="http-accept" data-x-href="https://httpwg.org/specs/rfc7231.html#header.accept"><code>Accept</code></dfn>` header</li>
      <li>`<dfn data-x="http-accept-language" data-x-href="https://httpwg.org/specs/rfc7231.html#header.accept-language"><code>Accept-Language</code></dfn>` header</li>
      <li>`<dfn data-x="http-cache-control" data-x-href="https://httpwg.org/specs/rfc7234.html#header.cache-control"><code>Cache-Control</code></dfn>` header</li>
@@ -60533,6 +60535,7 @@ fur
      <tr>
       <td>
       <th> <span data-x="attr-fs-method-GET">GET</span>
+      <th> <span data-x="attr-fs-method-POST">DELETE</span>
       <th> <span data-x="attr-fs-method-POST">POST</span>
       <th> <span data-x="attr-fs-method-POST">PUT</span>
       <th> <span data-x="attr-fs-method-POST">PATCH</span>
@@ -60541,13 +60544,19 @@ fur
      <tr>
       <th> <code data-x="">http</code>
       <td> <span data-x="submit-mutate-action">Mutate action URL</span>
+      <td> <span data-x="submit-mutate-action">Mutate action URL</span>
+      <td> <span data-x="submit-body">Submit as entity body</span>
+      <td> <span data-x="submit-body">Submit as entity body</span>
       <td> <span data-x="submit-body">Submit as entity body</span>
       <td> <span data-x="submit-body">Submit as entity body</span>
       <td> <span data-x="submit-body">Submit as entity body</span>
       <td> <span data-x="submit-mutate-action">Mutate action URL</span>
      <tr>
       <th> <code data-x="">https</code>
       <td> <span data-x="submit-mutate-action">Mutate action URL</span>
+      <td> <span data-x="submit-mutate-action">Mutate action URL</span>
+      <td> <span data-x="submit-body">Submit as entity body</span>
+      <td> <span data-x="submit-body">Submit as entity body</span>
       <td> <span data-x="submit-body">Submit as entity body</span>
       <td> <span data-x="submit-body">Submit as entity body</span>
       <td> <span data-x="submit-body">Submit as entity body</span>
@@ -60569,13 +60578,19 @@ fur
      <tr>
       <th> <code data-x="">data</code>
       <td> <span data-x="submit-mutate-action">Mutate action URL</span>
+      <td> <span data-x="submit-mutate-action">Mutate action URL</span>
+      <td> <span data-x="submit-get-action">Get action URL</span>
+      <td> <span data-x="submit-get-action">Get action URL</span>
       <td> <span data-x="submit-get-action">Get action URL</span>
       <td> <span data-x="submit-get-action">Get action URL</span>
       <td> <span data-x="submit-get-action">Get action URL</span>
       <td> <span data-x="submit-get-action">Mutate action URL</span>
      <tr>
       <th> <code data-x="">mailto</code>
       <td> <span data-x="submit-mailto-headers">Mail with headers</span>
+      <td> <span data-x="submit-mailto-headers">Mail with headers</span>
+      <td> <span data-x="submit-mailto-body">Mail as body</span>
+      <td> <span data-x="submit-mailto-body">Mail as body</span>
       <td> <span data-x="submit-mailto-body">Mail as body</span>
       <td> <span data-x="submit-mailto-body">Mail as body</span>
       <td> <span data-x="submit-mailto-body">Mail as body</span>
@@ -60612,7 +60627,8 @@ fur
        <li><p>Set the <code>form</code>'s <span>planned navigation</span> to null.</p></li>
 
        <li><p><span>Navigate</span><!--DONAV form--> <var>targetNavigable</var> to <var>url</var>
-       using the <code>form</code> element's <span>node document</span>, with <i
+       using the <code>form</code> element's <span>node document</span>,
+       with <i data-x="navigation-method">method</i> set to <var>method</var>, with <i
        data-x="navigation-hh">historyHandling</i> set to <var>historyHandling</var>, <i
        data-x="navigation-user-involvement">userInvolvement</i> set to <var>userInvolvement</var>,
        <i data-x="navigation-source-element">sourceElement</i> set to <var>submitter</var>,
@@ -96317,8 +96333,8 @@ callback <dfn callback>NavigationInterceptHandler</dfn> = <span data-x="idl-Prom
    <dd>
     <p>The <code>FormData</code> representing the submitted form entries for this navigation, if
     this navigation is a "<code data-x="dom-NavigationType-push">push</code>" or "<code
-    data-x="dom-NavigationType-replace">replace</code>" navigation representing a POST <span
-    data-x="concept-form-submit">form submission</span>; null otherwise.</p>
+    data-x="dom-NavigationType-replace">replace</code>" navigation representing a POST, PUT, or
+    PATCH <span data-x="concept-form-submit">form submission</span>; null otherwise.</p>
 
     <p>(Notably, this will be null even for "<code data-x="dom-NavigationType-reload">reload</code>"
     or "<code data-x="dom-NavigationType-traverse">traverse</code>" navigations that are revisiting
@@ -100214,6 +100230,9 @@ interface <dfn interface>NotRestoredReasons</dfn> {
 
    <li><p><dfn data-x="she-url">URL</dfn>, a <span>URL</span></p></li>
 
+   <li><p><dfn data-x="she-method">method</dfn>, an HTTP request
+   <span data-x="http-method">method</span>, initially set to GET</p></li>
+
    <li><p><dfn data-x="she-document-state">document state</dfn>, a <span>document
    state</span>.</p></li>
 
@@ -101257,7 +101276,9 @@ location.href = '#foo';</code></pre>
   <span>URL</span> <var>url</var> using an optional <code>Document</code>-or-null <var
   id="source-browsing-context">sourceDocument</var> (default null), with an optional <span>request
   resource</span>, string, or null <dfn for="navigate" data-x="navigation-resource"
-  export><var>documentResource</var></dfn> (default null), an optional <span
+  export><var>documentResource</var></dfn> (default null), an optional request
+  <span data-x="http-method">method</span> <dfn for="navigate"
+  data-x="navigation-method">method</dfn>, an optional <span
   data-x="concept-response">response</span>-or-null <dfn for="navigate" data-x="navigation-response"
   export><var>response</var></dfn> (default null), an optional boolean <dfn for="navigate"
   id="exceptions-enabled" export><var>exceptionsEnabled</var></dfn> (default false), an optional
@@ -101605,8 +101626,8 @@ location.href = '#foo';</code></pre>
      </li>
 
      <li><p>Let <var>historyEntry</var> be a new <span>session history entry</span>, with its <span
-     data-x="she-url">URL</span> set to <var>url</var> and its <span
-     data-x="she-document-state">document state</span> set to
+     data-x="she-url">URL</span> set to <var>url</var>, its <span data-x="she-method">method</span>
+     set to <var>method</var> and its <span data-x="she-document-state">document state</span> set to
      <var>documentState</var>.</p></li>
 
      <li><p>Let <var>navigationParams</var> be null.</p></li>
@@ -103595,8 +103616,8 @@ location.href = '#foo';</code></pre>
     <p>If <var>documentResource</var> is a <span>request resource</span>:</p>
 
     <ol>
-     <li><p>Set <var>request</var>'s <span data-x="concept-request-method">method</span> to `<code
-     data-x="">POST</code>`.</p></li>
+     <li><p>Set <var>request</var>'s <span data-x="concept-request-method">method</span> to
+     <var>entry</var>'s <span data-x="she-method">method</span>.</p></li>
 
      <li><p>Set <var>request</var>'s <span data-x="concept-request-body">body</span> to
      <var>documentResource</var>'s <span data-x="request-resource-request-body">request
@@ -104633,7 +104654,7 @@ location.href = '#foo';</code></pre>
        <li><p><span>In parallel</span>, <span>attempt to populate the history entry's
        document</span> for <var>targetEntry</var>, given <var>navigable</var>,
        <var>potentiallyTargetSpecificSourceSnapshotParams</var>, <var>targetSnapshotParams</var>,
-       <var>userInvolvement</var>, with <i data-x="attempt-to-populate-allow-post">allowUnsafe</i>
+       <var>userInvolvement</var>, with <i data-x="attempt-to-populate-allow-unsafe">allowUnsafe</i>
        set to <var>allowUnsafe</var> and <span data-x="attempt-to-populate-completion-steps">
        <i>completionSteps</i></span> set to <span>queue a global task</span> on the <span>navigation
        and traversal task source</span> given <var>navigable</var>'s
@@ -107692,10 +107713,9 @@ new PaymentRequest(&hellip;); // Allowed to use
 
   <p>When a user requests a <span>reload</span> of a <span>navigable</span> whose <span
   data-x="nav-active-history-entry">active session history entry</span>'s <span
-  data-x="she-document-state">document state</span>'s <span
-  data-x="document-state-resource">resource</span> is a <span>request resource</span>, the user agent
-  should prompt the user to confirm the operation first, since otherwise transactions (e.g.,
-  purchases or database modifications) could be repeated.</p>
+  data-x="she-method">method</span> is a non-<span data-x="http-idempotent-method">idempotent</span>
+  method, the user agent should prompt the user to confirm the operation first, since otherwise
+  transcations (e.g. purchases or database modifications) could be repeated.</p>
 
   <p>When a user requests a <span>reload</span> of a <span>navigable</span>, user agents may provide
   a mechanism for ignoring any caches when reloading.</p>
@@ -147424,6 +147444,7 @@ INSERT INTERFACES HERE
   Alexander Farkas,
   Alexander J. Vincent,
   Alexander Kalenik,
+  Alexander Petros,
   Alexandre Dieulot,
   Alexandre Morgaut,
   Alexey Feldgendler,