[css-ui-4] Define rendering behavior for <input>

Closes #1941

Author: frivoal

css-ui-4/Overview.bs

@@ -14,6 +14,14 @@ Coding style convention in this file:
 * Indent the content of <div class=note> and <div class=example>
 -->
 
+<pre class="anchors">
+spec: css2; urlPrefix: https://drafts.csswg.org/css2/
+    urlPrefix: box.html
+        type: dfn;
+            text: content edge;
+            text: padding edge;
+</pre>
+
 <pre class='metadata'>
 Title: CSS Basic User Interface Module Level 4
 ED: https://drafts.csswg.org/css-ui-4/
@@ -2562,6 +2570,23 @@ is also not changed by the 'appearance' property.
 	and activating (for example by clicking) the element would toggle the state as usual.
 </div>
 
+<h3 id=control-specific-rules>
+Form Control Specific Rules</h3>
+
+<h4 id=input-rules>
+Single-Line Text Input Controls</h4>
+
+When 'appearance' is ''appearance/auto'',
+single-line text input controls
+such as [[!HTML]] <code highlight=html>&lt;input type=text></code>
+must be rendered so that:
+
+* The content is clipped in the inline direction to the <a>content edge</a>
+* The content is clipped in the block direction to the <a>padding edge</a>
+* The content is vertically centered
+* The content does not wrap
+* The 'line-height' property has no effect
+* The 'text-overflow' property applies regardless of the value of the 'overflow' property
 
 <hr title="Separator from footer">
 
@@ -2626,8 +2651,15 @@ and
 
 This appendix is <em>informative</em>.
 
-This appendix describes functional changes from the
-<a href="https://www.w3.org/TR/2015/WD-css-ui-4-20150922/">22 Sep 2015 First Public Working Draft</a>.
+<h3 id=changes-22-12-2017 class=no-num>Changes from the
+<a href="https://www.w3.org/TR/2017/WD-css-ui-4-20171222/">22 December 2017 Working Draft</a></h3>
+
+<ul>
+	<li>Added details about form control specific rendering rules
+</ul>
+
+<h3 id=changes-22-09-2015 class=no-num>Changes from the
+<a href="https://www.w3.org/TR/2015/WD-css-ui-4-20150922/">22 Sep 2015 First Public Working Draft</a></h3>
 
 <ul>
 	<li>

css-ui-4/issues-fpwd-2015.html

@@ -106,6 +106,14 @@ <h1>CSS Basic User Interface Module Level 4 Disposition of Comments for 2015-09-
 Response: <a href='https://github.com/w3c/csswg-drafts/issues/2125#issuecomment-356971335'>https://github.com/w3c/csswg-drafts/issues/2125#issuecomment-356971335</a>
 Closed:   Accepted
 Resolved: Editorial</pre>
+<pre class='a' id='issue-10'>
+Issue 10. <a href='#issue-10'>#</a>
+Summary:  Rendering of &lt;input> is weird and undefined
+From:     isangelawu
+Comment:  <a href='https://github.com/w3c/csswg-drafts/issues/1941'>https://github.com/w3c/csswg-drafts/issues/1941</a>
+Response: <a href='https://github.com/w3c/csswg-drafts/issues/1941#issuecomment-345380779'>https://github.com/w3c/csswg-drafts/issues/1941#issuecomment-345380779</a>
+Closed:   Accepted
+Resolved: <a href='https://github.com/w3c/csswg-drafts/issues/1941#issuecomment-356685574'>https://github.com/w3c/csswg-drafts/issues/1941#issuecomment-356685574</a></pre>
 <script>
 (function () {
     var sheet = document.styleSheets[0];

css-ui-4/issues-fpwd-2015.txt

@@ -82,3 +82,11 @@ Comment:  https://github.com/w3c/csswg-drafts/issues/2125
 Response: https://github.com/w3c/csswg-drafts/issues/2125#issuecomment-356971335
 Closed:   Accepted
 Resolved: Editorial
+----
+Issue 10.
+Summary:  Rendering of <input> is weird and undefined
+From:     isangelawu
+Comment:  https://github.com/w3c/csswg-drafts/issues/1941
+Response: https://github.com/w3c/csswg-drafts/issues/1941#issuecomment-345380779
+Closed:   Accepted
+Resolved: https://github.com/w3c/csswg-drafts/issues/1941#issuecomment-356685574