Add the <iframe allowpaymentrequest> attribute

The `allowpaymentrequest` attribute is used by the Payment Request API
to determine if Document objects in an `iframe` element's browsing
context are to be allowed to make payment requests.

See
w3c/payment-request#311
w3c/payment-request#359

source

@@ -3762,6 +3762,19 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
 
  </dd>
 
+
+ <dt>Payment Request API</dt>
+
+ <dd>
+ <p>The following feature is defined in the <cite>Payment Request API</cite> specification:
+ <ref spec=PAYMENTREQUEST></p>
+
+ <ul class="brief">
+ <li><dfn data-x-href="https://w3c.github.io/browser-payment-api/#paymentrequest-interface"><code>PaymentRequest</code></dfn> interface</li>
+ </ul>
+ </dd>
+
+
  <dt>MathML</dt>
 
  <dd>
@@ -28046,6 +28059,7 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
  <dd><code data-x="attr-iframe-name">name</code></dd>
  <dd><code data-x="attr-iframe-sandbox">sandbox</code></dd>
  <dd><code data-x="attr-iframe-allowfullscreen">allowfullscreen</code></dd>
+ <dd><code data-x="attr-iframe-allowpaymentrequest">allowpaymentrequest</code></dd>
  <dd><code data-x="attr-iframe-allowusermedia">allowusermedia</code></dd>
  <dd><code data-x="attr-dim-width">width</code></dd>
  <dd><code data-x="attr-dim-height">height</code></dd>
@@ -28059,6 +28073,7 @@ interface <dfn>HTMLIFrameElement</dfn> : <span>HTMLElement</span> {
  [<span>CEReactions</span>] attribute DOMString <span data-x="dom-iframe-name">name</span>;
  [<span>CEReactions</span>, SameObject, PutForwards=<span data-x="dom-DOMTokenList-value">value</span>] readonly attribute <span>DOMTokenList</span> <span data-x="dom-iframe-sandbox">sandbox</span>;
  [<span>CEReactions</span>] attribute boolean <span data-x="dom-iframe-allowFullscreen">allowFullscreen</span>;
+ [<span>CEReactions</span>] attribute boolean <span data-x="dom-iframe-allowPaymentRequest">allowPaymentRequest</span>;
  [<span>CEReactions</span>] attribute boolean <span data-x="dom-iframe-allowUserMedia">allowUserMedia</span>;
  [<span>CEReactions</span>] attribute DOMString <span data-x="dom-dim-width">width</span>;
  [<span>CEReactions</span>] attribute DOMString <span data-x="dom-dim-height">height</span>;
@@ -28576,6 +28591,11 @@ interface <dfn>HTMLIFrameElement</dfn> : <span>HTMLElement</span> {
 
  </div>
 
+ <p>The <dfn><code data-x="attr-iframe-allowpaymentrequest">allowpaymentrequest</code></dfn>
+ attribute is a <span>boolean attribute</span>. When specified, it indicates that
+ <code>Document</code> objects in the <code>iframe</code> element's <span>browsing context</span>
+ are to be allowed to use the <code>PaymentRequest</code> interface to make payment requests.</p>
+
  <p>The <dfn><code data-x="attr-iframe-allowusermedia">allowusermedia</code></dfn> attribute is a
  <span>boolean attribute</span>. When specified, it indicates that <code>Document</code> objects in
  the <code>iframe</code> element's <span>browsing context</span> are to be allowed to use <code
@@ -28652,6 +28672,10 @@ interface <dfn>HTMLIFrameElement</dfn> : <span>HTMLElement</span> {
  must <span>reflect</span> the <code data-x="attr-iframe-allowfullscreen">allowfullscreen</code>
  content attribute.</p>
 
+ <p>The <dfn><code data-x="dom-iframe-allowPaymentRequest">allowPaymentRequest</code></dfn> IDL
+ attribute must <span>reflect</span> the <code
+ data-x="attr-iframe-allowpaymentrequest">allowpaymentrequest</code> content attribute.</p>
+
  <p>The <dfn><code data-x="dom-iframe-allowUserMedia">allowUserMedia</code></dfn> IDL attribute
  must <span>reflect</span> the <code data-x="attr-iframe-allowusermedia">allowusermedia</code>
  content attribute.</p>
@@ -114893,6 +114917,7 @@ interface <dfn>External</dfn> {
  <code data-x="attr-iframe-name">name</code>;
  <code data-x="attr-iframe-sandbox">sandbox</code>;
  <code data-x="attr-iframe-allowfullscreen">allowfullscreen</code>;
+ <code data-x="attr-iframe-allowpaymentrequest">allowpaymentrequest</code>;
  <code data-x="attr-iframe-allowusermedia">allowusermedia</code>;
  <code data-x="attr-dim-width">width</code>;
  <code data-x="attr-dim-height">height</code>;
@@ -116390,6 +116415,11 @@ interface <dfn>External</dfn> {
  <td> <code data-x="attr-iframe-allowfullscreen">iframe</code>
  <td> Whether to allow the <code>iframe</code>'s contents to use <code data-x="dom-element-requestFullscreen">requestFullscreen()</code>
  <td> <span>Boolean attribute</span>
+ <tr>
+ <th> <code data-x="">allowpaymentrequest</code>
+ <td> <code data-x="attr-iframe-allowpaymentrequest">iframe</code>
+ <td> Whether the <code>iframe</code>'s contents are allowed to use the <code>PaymentRequest</code> interface to make payment requests
+ <td> <span>Boolean attribute</span>
  <tr>
  <th> <code data-x="">allowusermedia</code>
  <td> <code data-x="attr-iframe-allowusermedia">iframe</code>
@@ -119077,6 +119107,9 @@ INSERT INTERFACES HERE
  <dt id="refsPAGEVIS">[PAGEVIS]</dt>
  <dd>(Non-normative) <cite><a href="https://w3c.github.io/web-performance/specs/PageVisibility/Overview.html">Page Visibility</a></cite>, J. Mann, A. Jain. W3C.</dd>
 
+ <dt id="refsPAYMENTREQUEST">[PAYMENTREQUEST]</dt>
+ <dd><cite><a href="https://w3c.github.io/browser-payment-api/">Payment Request API</a></cite>, A. Bateman, Z. Koch, R. McElmurry. W3C.</dd>
+
  <dt id="refsPDF">[PDF]</dt>
  <dd>(Non-normative) <cite><a href="https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/PDF32000_2008.pdf">Document management &mdash; Portable document format &mdash; Part 1: PDF</a></cite>. ISO.</dd>