Editorial: note for invalid argument delete()

Closes whatwg#372.

Overview.html

@@ -7,7 +7,7 @@
 
 <p><a class="logo" href="https://whatwg.org/"><img alt="WHATWG" height="100" src="https://resources.whatwg.org/logo-fetch.svg" width="100"></a>
 <h1 id="cors">Fetch</h1>
-<h2 class="no-num no-toc" id="living-standard-—-last-updated-13-october-2016">Living Standard — Last Updated 13 October 2016</h2>
+<h2 class="no-num no-toc" id="living-standard-—-last-updated-17-october-2016">Living Standard — Last Updated 17 October 2016</h2>
 
 <dl>
  <dt>Participate:
@@ -4218,9 +4218,13 @@ <h3 id="headers-class"><span class="secno">6.1 </span>Headers class</h3>
  "<code title="">request</code>" and <var>name</var> is a <a href="#forbidden-header-name">forbidden header name</a>,
  return.
 
- <li><p>Otherwise, if <a href="#concept-headers-guard" title="concept-Headers-guard">guard</a> is
- "<code title="">request-no-cors</code>" and <var>name</var>/`<code title="">invalid</code>` is
- not a <a href="#cors-safelisted-request-header">CORS-safelisted request-header</a>, return.
+ <li>
+  <p>Otherwise, if <a href="#concept-headers-guard" title="concept-Headers-guard">guard</a> is "<code>request-no-cors</code>"
+  and <var>name</var>/`<code>invalid</code>` is not a <a href="#cors-safelisted-request-header">CORS-safelisted request-header</a>,
+  then return.
+
+  <p class="note">`<code>invalid</code>` is used because
+  <a href="#dom-headers-delete"><code title="dom-Headers-delete">delete()</code></a> is not passed a value as argument.
 
  <li><p>Otherwise, if <a href="#concept-headers-guard" title="concept-Headers-guard">guard</a> is
  "<code title="">response</code>" and <var>name</var> is a
@@ -5752,6 +5756,7 @@ <h2 class="no-num" id="acknowledgments">Acknowledgments</h2>
 Jake Archibald<!-- technically B.J. Archibald -->,
 James Graham,
 Janusz Majnert,
+Jeena Lee,
 Jeff Carpenter,
 Jeff Hodges,
 Jeffrey Yasskin,
@@ -5806,6 +5811,7 @@ <h2 class="no-num" id="acknowledgments">Acknowledgments</h2>
 Ryan Sleevi,
 Rory Hewitt,
 Sébastien Cevey,
+Sendil Kumar N,
 Shao-xuan Kang,
 Sharath Udupa,
 Shivakumar Jagalur Matt,

fetch.bs

@@ -4239,7 +4239,10 @@ method, when invoked, must run these steps:
 
  <li><p>Otherwise, if <a for=Headers>guard</a> is
  "<code>request-no-cors</code>" and <var>name</var>/`<code>invalid</code>` is
- not a <a>CORS-safelisted request-header</a>, return.
+ not a <a>CORS-safelisted request-header</a>, then return.
+
+  <p class=note>`<code>invalid</code>` is used because
+  <a method for=Headers><code>delete()</code></a> is not passed a value as argument.
 
  <li><p>Otherwise, if <a for=Headers>guard</a> is
  "<code>response</code>" and <var>name</var> is a
@@ -5680,6 +5683,7 @@ Ilya Grigorik,
 Jake Archibald<!-- technically B.J. Archibald -->,
 James Graham,
 Janusz Majnert,
+Jeena Lee,
 Jeff Carpenter,
 Jeff Hodges,
 Jeffrey Yasskin,
@@ -5734,6 +5738,7 @@ R. Auburn,
 Ryan Sleevi,
 Rory Hewitt,
 Sébastien Cevey,
+Sendil Kumar N,
 Shao-xuan Kang,
 Sharath Udupa,
 Shivakumar Jagalur Matt,