Report more parse errors. Fixes https://www.w3.org/Bugs/Public/show_b…

…ug.cgi?id=27687

Also ack @sleevi for previous commit.

url.bs

@@ -252,7 +252,7 @@ eight <dfn id=concept-ipv6-piece lt='IPv6 piece'>16-bit pieces</dfn>.
  <i>UseSTD3ASCIIRules</i> set to false, <i>processing_option</i> set to
  <i>Transitional_Processing</i>, and <i>VerifyDnsLength</i> set to false.
 
- <li><p>If <var>result</var> is a failure value, return failure.
+ <li><p>If <var>result</var> is a failure value, <a>parse error</a>, return failure.
 
  <li><p>Return <var>result</var>.
 </ol>
@@ -266,10 +266,8 @@ eight <dfn id=concept-ipv6-piece lt='IPv6 piece'>16-bit pieces</dfn>.
  <i>domain_name</i> set to <var>domain</var>,
  <i>UseSTD3ASCIIRules</i> set to false.
 
- <li>
-  <p>Return <var>result</var>, ignoring any returned errors.
-
-  <p class=note>User agents are encouraged to report errors through a developer console.
+ <li><p>Signify <a>parse errors</a> any returned errors, and then, return
+ <var>result</var>.
 </ol>
 
 
@@ -367,7 +365,7 @@ steps:
   "<code>\</code>",<!-- 5C -->
   and
   "<code>]</code>",<!-- 5D -->
-  return failure.
+  <a>parse error</a>, return failure.
 
  <li><p>Let <var>ipv4Host</var> be the result of <a lt="IPv4 parser">IPv4 parsing</a>
  <var>asciiDomain</var>.
@@ -450,11 +448,12 @@ runs these steps:
    <li><p>Append <var>n</var> to <var>numbers</var>.
   </ol>
 
- <li><p>If any but the last item in <var>numbers</var> is greater than 255, return
- failure.
+ <li><p>If any but the last item in <var>numbers</var> is greater than 255,
+ <a>parse error</a> return failure.
 
  <li><p>If the last item in <var>numbers</var> is greater than or equal to
- 256<sup>(5 &minus; the number of items in <var>numbers</var>)</sup>, return failure.
+ 256<sup>(5 &minus; the number of items in <var>numbers</var>)</sup>,
+ <a>parse error</a>, return failure.
 
  <li><p>Let <var>ipv4</var> be the last item in <var>numbers</var>.
 
@@ -1023,6 +1022,9 @@ optionally with an <a>encoding</a>
   <ol>
    <li><p>Set <var>url</var> to a new <a>URL</a>.
 
+   <li><p>If <var>input</var> contains any leading or trailing
+   <a>C0 controls and space</a>, <a>parse error</a>.
+
    <li><p>Remove any leading and trailing <a>C0 controls and space</a> from
    <var>input</var>.
   </ol>
@@ -3019,6 +3021,7 @@ Michel Suignard,
 Peter Occil,
 Rodney Rehm,
 Roy Fielding,
+Ryan Sleevi,
 Santiago M. Mola,
 Sebastian Mayr,
 Simon Pieters,

url.html

@@ -439,7 +439,7 @@ <h3 class="heading settled" data-level="3.1" id="idna"><span class="secno">3.1.
 
  </p>
     <li>
-     <p>If <var>result</var> is a failure value, return failure.
+     <p>If <var>result</var> is a failure value, <a data-link-type="dfn" href="#parse-error">parse error</a>, return failure.
 
  </p>
     <li>
@@ -461,11 +461,8 @@ <h3 class="heading settled" data-level="3.1" id="idna"><span class="secno">3.1.
 
  </p>
     <li>
-
-     <p>Return <var>result</var>, ignoring any returned errors.
-
-  </p>
-     <p class="note" role="note">User agents are encouraged to report errors through a developer console.
+     <p>Signify <a data-link-type="dfn" href="#parse-error">parse errors</a> any returned errors, and then, return
+ <var>result</var>.
 </p></ol>
 
 
@@ -598,7 +595,7 @@ <h3 class="heading settled" data-level="3.3" id="host-parsing"><span class="secn
   "<code>\</code>",
   and
   "<code>]</code>",
-  return failure.
+  <a data-link-type="dfn" href="#parse-error">parse error</a>, return failure.
 
  </p>
     <li>
@@ -741,13 +738,14 @@ <h3 class="heading settled" data-level="3.3" id="host-parsing"><span class="secn
 
 
     <li>
-     <p>If any but the last item in <var>numbers</var> is greater than 255, return
- failure.
+     <p>If any but the last item in <var>numbers</var> is greater than 255,
+ <a data-link-type="dfn" href="#parse-error">parse error</a> return failure.
 
  </p>
     <li>
      <p>If the last item in <var>numbers</var> is greater than or equal to
- 256<sup>(5 − the number of items in <var>numbers</var>)</sup>, return failure.
+ 256<sup>(5 − the number of items in <var>numbers</var>)</sup>,
+ <a data-link-type="dfn" href="#parse-error">parse error</a>, return failure.
 
  </p>
     <li>
@@ -1591,6 +1589,11 @@ <h3 class="heading settled" data-level="4.2" id="url-parsing"><span class="secno
       <li>
        <p>Set <var>url</var> to a new <a data-link-type="dfn" href="#concept-url">URL</a>.
 
+   </p>
+      <li>
+       <p>If <var>input</var> contains any leading or trailing
+   <a data-link-type="dfn" href="#c0-controls-and-space">C0 controls and space</a>, <a data-link-type="dfn" href="#parse-error">parse error</a>.
+
    </p>
       <li>
        <p>Remove any leading and trailing <a data-link-type="dfn" href="#c0-controls-and-space">C0 controls and space</a> from
@@ -4679,6 +4682,7 @@ <h2 class="no-num heading settled" id="acknowledgments"><span class="content">Ac
 Peter Occil,
 Rodney Rehm,
 Roy Fielding,
+Ryan Sleevi,
 Santiago M. Mola,
 Sebastian Mayr,
 Simon Pieters,