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spec/Overview.html 1.2095 2930 Discuss overlapping paragraphs. (bug 650

From: poot <cvsmail@w3.org>
Date: Tue, 31 Mar 2009 12:40:37 +0900 (JST)
To: public-html-diffs@w3.org
Message-Id: <20090331034037.502772BC27@toro.w3.mag.keio.ac.jp>
Discuss overlapping paragraphs. (bug 6507) (whatwg r2930)
http://www.w3.org/Bugs/Public/show_bug.cgi?id=6507

3.6 APIs in HTML documents
http://people.w3.org/mike/diffs/html5/spec/Overview.1.2095.html#apis-in-html-documents
3.5 Paragraphs
http://people.w3.org/mike/diffs/html5/spec/Overview.1.2095.html#paragraphs

http://people.w3.org/mike/diffs/html5/spec/Overview.diff.html
http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.2094&r2=1.2095&f=h
http://html5.org/tools/web-apps-tracker?from=2929&to=2930

===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.2094
retrieving revision 1.2095
diff -u -d -r1.2094 -r1.2095
--- Overview.html	31 Mar 2009 01:48:11 -0000	1.2094
+++ Overview.html	31 Mar 2009 03:38:50 -0000	1.2095
@@ -7616,13 +7616,28 @@
   what the document looks like without the <code><a href=#the-a-element>a</a></code>,
   <code><a href=#the-ins-element>ins</a></code> and <code><a href=#the-del-element>del</a></code> elements complicating matters,
   since those elements, with their hybrid content models, can straddle
-  paragraph boundaries.<p>Let <var title="">view</var> be a view of the DOM that replaces
+  paragraph boundaries.<p class=note>Generally, having elements straddle paragraph
+  boundaries is best avoided. Maintaining such markup can be
+  difficult.<div class=impl>
+
+  <p>Let <var title="">view</var> be a view of the DOM that replaces
   all <code><a href=#the-a-element>a</a></code>, <code><a href=#the-ins-element>ins</a></code> and <code><a href=#the-del-element>del</a></code> elements
-  in the document with their contents. Then, in <var title="">view</var>, for each run of <a href=#phrasing-content-0>phrasing content</a>
-  uninterrupted by other types of content, in an element that accepts
-  content other than <a href=#phrasing-content-0>phrasing content</a>, let <var title="">first</var> be the first node of the run, and let <var title="">last</var> be the last node of the run. For each run, a
-  paragraph exists in the original DOM from immediately before <var title="">first</var> to immediately after <var title="">last</var>. (Paragraphs can thus span across
-  <code><a href=#the-a-element>a</a></code>, <code><a href=#the-ins-element>ins</a></code> and <code><a href=#the-del-element>del</a></code> elements.)<p>A <a href=#paragraph>paragraph</a> is also formed explicitly by
+  in the document with their contents. Then, in <var title="">view</var>, for each run of sibling <a href=#phrasing-content-0>phrasing
+  content</a> nodes uninterrupted by other types of content, in an
+  element that accepts content other than <a href=#phrasing-content-0>phrasing
+  content</a>, let <var title="">first</var> be the first node of
+  the run, and let <var title="">last</var> be the last node of the
+  run. For each such run that consists of at least one node that is
+  neither <a href=#embedded-content-2>embedded content</a> nor <a href=#inter-element-whitespace>inter-element
+  whitespace</a>, a paragraph exists in the original DOM from
+  immediately before <var title="">first</var> to immediately after
+  <var title="">last</var>. (Paragraphs can thus span across
+  <code><a href=#the-a-element>a</a></code>, <code><a href=#the-ins-element>ins</a></code> and <code><a href=#the-del-element>del</a></code> elements.)</p>
+
+  <p>Conformance checkers may warn authors of cases where they have
+  paragraphs that overlap each other.</p>
+
+  </div><p>A <a href=#paragraph>paragraph</a> is also formed explicitly by
   <code><a href=#the-p-element>p</a></code> elements.<p class=note>The <code><a href=#the-p-element>p</a></code> element can be used to wrap
   individual paragraphs when there would otherwise not be any content
   other than phrasing content to separate the paragraphs from each
@@ -7631,7 +7646,7 @@
    <p>In the following example, there are two paragraphs in a
    section. There is also a header, which contains phrasing content
    that is not a paragraph. Note how the comments and
-   <span>intra-element whitespace</span> do not form paragraphs.</p>
+   <a href=#inter-element-whitespace>inter-element whitespace</a> do not form paragraphs.</p>
 
    <pre>&lt;section&gt;
   &lt;h1&gt;Example of paragraphs&lt;/h1&gt;
@@ -7682,9 +7697,56 @@
  Falcon's innermost secrets.&lt;/p&gt;
 &lt;/aside&gt;</pre>
 
-  </div><p class=note>Generally, having elements straddle paragraph
-  boundaries is best avoided. Maintaining such markup can be
-  difficult.<h3 id=apis-in-html-documents><span class=secno>3.6 </span>APIs in HTML documents</h3><p>For <a href=#html-documents>HTML documents</a>, and for <a href=#html-elements>HTML
+  </div><div class=example>
+
+   <!-- I don't know if there's a better way to deal with this, but if
+   there is, let me know... -->
+
+   <p>It is possible for paragraphs to overlap when using certain
+   elements that define fallback content. For example, in the
+   following section:</p>
+
+   <pre>&lt;section&gt;
+ &lt;h1&gt;My Cats&lt;/h1&gt;
+ You can play with my cat simulator.
+ &lt;object data="cats.sim"&gt;
+  To see the cat simulator, use one of the following links:
+  &lt;ul&gt;
+   &lt;li&gt;&lt;a href="cats.sim"&gt;Download simulator file&lt;/a&gt;
+   &lt;li&gt;&lt;a href="http://sims.example.com/watch?v=LYds5xY4INU"&gt;Use online simulator&lt;/a&gt;
+  &lt;/ul&gt;
+  Alternatively, upgrade to the Mellblom Browser.
+ &lt;/object&gt;
+ I'm quite proud of it.
+&lt;/section&gt;</pre>
+
+   <p>There are five paragraphs:</p>
+
+   <ol class=brief><li>The paragraph that says "You can play with my cat
+    simulator. <i title="">object</i> I'm quite proud of it.", where
+    <i title="">object</i> is the <code><a href=#the-object-element>object</a></code> element.</li>
+
+    <li>The paragraph that says "To see the cat simulator, use one of
+    the following links:".</li>
+
+    <li>The paragraph that says "Download simulator file".</li>
+
+    <li>The paragraph that says "Use online simulator".</li>
+
+    <li>The paragraph that says "Alternatively, upgrade to the Mellblom Browser.".</li>
+
+   </ol><p>The first paragraph is overlapped by the other four. A user
+   agent that supports the "cats.sim" resource will only show the
+   first one, but a user agent that shows the fallback will
+   confusingly show the the first sentence of the first paragraph as
+   if it was in the same paragraph as the second one, and will show
+   the last paragraph as if it was at the start of the second sentence
+   of the the first paragraph.</p>
+
+   <p>To avoid this confusion, explicit <code><a href=#the-p-element>p</a></code> elements can be
+   used.</p>
+
+  </div><h3 id=apis-in-html-documents><span class=secno>3.6 </span>APIs in HTML documents</h3><p>For <a href=#html-documents>HTML documents</a>, and for <a href=#html-elements>HTML
   elements</a> in <a href=#html-documents>HTML documents</a>, certain APIs defined
   in DOM3 Core become case-insensitive or case-changing, as sometimes
   defined in DOM3 Core, and as summarized <span class=impl>or
Received on Tuesday, 31 March 2009 03:41:14 GMT

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