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 <section id="nacl-and-pnacl">
 <span id="id1"></span><h1 id="nacl-and-pnacl"><span id="id1"></span>NaCl and PNaCl</h1>
 <p>This document describes the differences between <strong>Native Client</strong> and
 <strong>Portable Native Client</strong>, and provides recommendations for when to use each.</p>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#native-client-nacl" id="id3">Native Client (NaCl)</a></li>
 <li><a class="reference internal" href="#portable-native-client-pnacl" id="id4">Portable Native Client (PNaCl)</a></li>
 <li><a class="reference internal" href="#when-to-use-pnacl" id="id5">When to use PNaCl</a></li>
 <li><a class="reference internal" href="#when-to-use-nacl" id="id6">When to use NaCl</a></li>
 </ul>
 
-</div><section id="native-client-nacl">
-<h2 id="native-client-nacl">Native Client (NaCl)</h2>
+</div><h2 id="native-client-nacl">Native Client (NaCl)</h2>
 <p>Native Client enables the execution of native code securely inside web
 applications through the use of advanced <a class="reference external" href="/native-client/community/talks#research">Software Fault Isolation (SFI)
 techniques</a>.  Since its launch in
 2011, Native Client has provided developers with the ability to harness a
 client machine&#8217;s computational power to a much fuller extent than traditional
 web technologies, by running compiled C and C++ code at near-native speeds and
 taking advantage of multiple cores with shared memory.</p>
 <p>While Native Client provides operating system independence, it requires
 developers to generate architecture-specific executable modules
 (<strong>nexe</strong> modules) for each hardware platform. This is not only inconvenient
 for developers, but architecture-specific machine code is not portable and thus
 not well-suited for the open web. The traditional method of application
 distribution on the web is through a self-contained bundle of HTML, CSS,
 JavaScript, and other resources (images, etc.) that can be hosted on a server
 and run inside a web browser.  With this type of distribution, a website
 created today should still work years later, on all platforms.
 Architecture-specific executables are clearly not a good fit for distribution
 on the web. As a consequence, Native Client has been restricted to
 applications and browser extensions that are installed through the
 Chrome Web Store.</p>
-</section><section id="portable-native-client-pnacl">
 <h2 id="portable-native-client-pnacl">Portable Native Client (PNaCl)</h2>
 <p>PNaCl solves the portability problem by splitting the compilation process
 into two parts:</p>
 <ol class="arabic simple">
 <li>compiling the source code to a portable bitcode format, and</li>
 <li>translating the bitcode to a host-specific executable.</li>
 </ol>
 <p>PNaCl enables developers
 to distribute <strong>portable executables</strong> (<strong>pexe</strong> modules) that the hosting
 environment (e.g., the Chrome browser) can translate to native code before
@@ skipping 12 matching lines @@
 client-side translation will automatically be able to take advantage of
 the new capabilities.</p>
 <p><strong>In short, PNaCl combines the portability of existing web technologies with
 the performance and security benefits of Native Client.</strong></p>
 <p>With the advent of PNaCl, the distribution restriction of Native Client
 can be lifted. Specifically, a <strong>pexe</strong> module can be part of any web
 application&#8212;it does not have to be distributed through the Chrome Web
 Store.</p>
 <p>PNaCl is a new technology, and as such it still has a few limitations
 as compared to NaCl. These limitations are described below.</p>
-</section><section id="when-to-use-pnacl">
 <h2 id="when-to-use-pnacl">When to use PNaCl</h2>
 <p>PNaCl is the preferred toolchain for Native Client, and the only way to deploy
 Native Client modules on the open web. Unless your project is subject to one
 of the narrow limitations described below
 (see <a class="reference internal" href="#when-to-use-nacl"><em>When to use NaCl</em></a>), you should use PNaCl.</p>
 <p>Beginning with version 31, the Chrome browser supports translation of
 <strong>pexe</strong> modules and their use in web applications, without requiring
 any installation (either of a browser plugin or of the applications
 themselves). Native Client and PNaCl are open-source technologies, and
 our hope is that they will be added to other hosting platforms in the
 future.</p>
 <p>If controlled distribution through the Chrome Web Store is an important part
 of your product plan, the benefits of PNaCl are less critical for you. But
 you can still use the PNaCl toolchain and distribute your application
 through the Chrome Web Store, and thereby take advantage of the
 conveniences of PNaCl, such as not having to explicitly compile your application
 for all supported architectures.</p>
-</section><section id="when-to-use-nacl">
-<span id="id2"></span><h2 id="when-to-use-nacl"><span id="id2"></span>When to use NaCl</h2>
+<h2 id="when-to-use-nacl"><span id="id2"></span>When to use NaCl</h2>
 <p>The limitations below apply to the current release of PNaCl. If any of
 these limitations are critical for your application, you should use
 non-portable NaCl:</p>
 <ul class="small-gap">
 <li>By its nature, PNaCl does not support architecture-specific
 instructions in an application (i.e., inline assembly), but tries to
 offer high-performance portable equivalents. One such example is
 PNaCl&#8217;s <a class="reference internal" href="/native-client/reference/pnacl-c-cpp-language-support.html#portable-simd-vectors"><em>Portable SIMD Vectors</em></a>.</li>
 <li>Currently PNaCl only supports static linking with the <code>newlib</code>
 C standard library (the Native Client SDK provides a PNaCl port of
 <code>newlib</code>). Dynamic linking and <code>glibc</code> are not yet supported.
 Work is under way to enable dynamic linking in future versions of PNaCl.</li>
 <li>In the initial release, PNaCl does not support some GNU extensions
 like taking the address of a label for computed <code>goto</code>, or nested
 functions.</li>
 </ul>
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