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  <title>App/UI/HTML Browser - XOWA</title>
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  <h1 id="firstHeading" class="firstHeading"><span>App/UI/HTML Browser</span></h1>
  <div id="bodyContent" class="mw-body-content">
    <div id="siteSub">From XOWA: the free, open-source, offline wiki application</div>
    <div id="contentSub"></div>
    <div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr">
    
    <p>
      The HTML Browser is a core part of the XOWA application.
    </p>
    <div id="toc" class="toc">
      <div id="toctitle" class="toctitle">
        <h2>
          Contents
        </h2>
      </div>
      <ul>
        <li class="toclevel-1 tocsection-1">
          <a href="#Overview"><span class="tocnumber">1</span> <span class="toctext">Overview</span></a>
        </li>
        <li class="toclevel-1 tocsection-2">
          <a href="#HTTP_Server"><span class="tocnumber">2</span> <span class="toctext">HTTP Server</span></a>
        </li>
        <li class="toclevel-1 tocsection-3">
          <a href="#Android"><span class="tocnumber">3</span> <span class="toctext">Android</span></a>
        </li>
        <li class="toclevel-1 tocsection-4">
          <a href="#SWT"><span class="tocnumber">4</span> <span class="toctext">SWT</span></a> 
          <ul>
            <li class="toclevel-2 tocsection-5">
              <a href="#Mozilla_(XULRunner)"><span class="tocnumber">4.1</span> <span class="toctext">Mozilla (XULRunner)</span></a> 
              <ul>
                <li class="toclevel-3 tocsection-6">
                  <a href="#Background"><span class="tocnumber">4.1.1</span> <span class="toctext">Background</span></a>
                </li>
                <li class="toclevel-3 tocsection-7">
                  <a href="#ESR_limitation"><span class="tocnumber">4.1.2</span> <span class="toctext">ESR limitation</span></a>
                </li>
              </ul>
            </li>
            <li class="toclevel-2 tocsection-8">
              <a href="#WebKit"><span class="tocnumber">4.2</span> <span class="toctext">WebKit</span></a>
            </li>
            <li class="toclevel-2 tocsection-9">
              <a href="#None"><span class="tocnumber">4.3</span> <span class="toctext">None</span></a>
            </li>
          </ul>
        </li>
        <li class="toclevel-1 tocsection-10">
          <a href="#Current_state_of_the_SWT_HTML_Browser_by_operating_systems"><span class="tocnumber">5</span> <span class="toctext">Current state of the SWT HTML Browser by operating systems</span></a> 
          <ul>
            <li class="toclevel-2 tocsection-11">
              <a href="#Windows"><span class="tocnumber">5.1</span> <span class="toctext">Windows</span></a>
            </li>
            <li class="toclevel-2 tocsection-12">
              <a href="#Mac_OS_X"><span class="tocnumber">5.2</span> <span class="toctext">Mac OS X</span></a>
            </li>
            <li class="toclevel-2 tocsection-13">
              <a href="#Linux"><span class="tocnumber">5.3</span> <span class="toctext">Linux</span></a>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <h2>
      <span class="mw-headline" id="Overview">Overview</span>
    </h2>
    <p>
      The XOWA GUI application embeds a web browser to show the wiki pages.
    </p>
    <h2>
      <span class="mw-headline" id="HTTP_Server">HTTP Server</span>
    </h2>
    <p>
      XOWA HTTP Server does not use the embedded XOWA web browser.
    </p>
    <h2>
      <span class="mw-headline" id="Android">Android</span>
    </h2>
    <p>
      XOWA droid uses the built in WebView that comes with Android.
    </p>
    <h2>
      <span class="mw-headline" id="SWT">SWT</span>
    </h2>
    <p>
      XOWA uses SWT for its Web Browser across all 3 major operating systems: Windows, Linux, Mac OS X.
    </p>
    <p>
      SWT provides 3 different modes for its Web Browser: mozilla, webkit and none. These can be configured through /xowa/user/anonymous/app/os_name.gfs with the following snippet:
    </p>
<pre>
app.gui {
  browser_type = 'mozilla';
}
</pre>
    <p>
      More information on the 3 modes are below
    </p>
    <h3>
      <span class="mw-headline" id="Mozilla_(XULRunner)">Mozilla (XULRunner)</span>
    </h3>
    <h4>
      <span class="mw-headline" id="Background">Background</span>
    </h4>
    <p>
      <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/XULRunner" rel="nofollow" class="external text">XULRunner</a> is a runtime package provided by Mozilla that can be used to build Firefox-like applications. It can be deployed in a standalone package that does not interfere with any installed versions of Firefox.
    </p>
    <p>
      The download location for xulrunner is <a href="http://ftp.mozilla.org/pub/mozilla.org/xulrunner/releases/" rel="nofollow" class="external free">http://ftp.mozilla.org/pub/mozilla.org/xulrunner/releases/</a>
    </p>
    <p>
      XOWA includes xulrunner at /xowa/operating_system_name/xulrunner . For example, on Linux 64-bit, this folder is at /xowa/linux_64/xulrunner/
    </p>
    <p>
      XOWA can use different versions of xulrunner with something like the following snippet:
    </p>
<pre>
app.gui {
  browser_type = 'mozilla';
  xul_runner_path = '~{&lt;&gt;bin_plat_dir&lt;&gt;}xulrunner_v24';
}
</pre>
    <h4>
      <span class="mw-headline" id="ESR_limitation">ESR limitation</span>
    </h4>
    <p>
      Mozilla Firefox has Extended Support Releases (ESRs). These start at version 10 and occur at 7-step intervals: 10, 17, 24, 31, 38.
    </p>
    <p>
      Each version of SWT limits compatibility to a specific XULRunner ESR. For SWT version 4.5, the highest XULRunner is 31. Also, non-ESR versions are not allowed. For example, SWT will fail if using XULRunner v30.
    </p>
    <h3>
      <span class="mw-headline" id="WebKit">WebKit</span>
    </h3>
    <p>
      SWT can also be configured to use the system's default WebKit browser. In most cases, this relates directly to Safari and is easiest done on a Mac OS X system. It can be done for Linux / Windows, but further steps need to be taken. See <a href="https://www.eclipse.org/swt/faq.php#howusewebkit" rel="nofollow" class="external free">https://www.eclipse.org/swt/faq.php#howusewebkit</a>
    </p>
    <p>
      XOWA may support WebKit on Linux / Windows at a future date, but for now, it is not a backlog item. If you are interested, please contact me and I will reevaluate.
    </p>
    <p>
      If you're on Linux, and want to experiment, you can try the following:
    </p>
    <ul>
      <li>
        Open the following file in your text editor: /xowa/user/anonymous/app/os.linux_64.gfs
      </li>
      <li>
        Change <code>browser_type</code> to <code>webkit</code>. When you're done, it should look something like this:
      </li>
    </ul>
<pre>
app.gui {
  browser_type = 'webkit';
}
</pre>
    <ul>
      <li>
        Run XOWA
      </li>
    </ul>
    <p>
      Note this may not work on systems with proper webkit support.
    </p>
    <h3>
      <span class="mw-headline" id="None">None</span>
    </h3>
    <p>
      SWT can also be configured to use the system's browser through the keyword "none". For all intents and purposes, this basically applies to using Internet Explorer on Windows machines.
    </p>
    <p>
      XOWA does not support Internet Explorer. It may do so in the future, but it would be dependent on the ease of the Javascript / CSS integration.
    </p>
    <h2>
      <span class="mw-headline" id="Current_state_of_the_SWT_HTML_Browser_by_operating_systems">Current state of the SWT HTML Browser by operating systems</span>
    </h2>
    <h3>
      <span class="mw-headline" id="Windows">Windows</span>
    </h3>
    <p>
      As of v2.6.5, XOWA uses XUL Runner 24 for both Windows 32 bit and Windows 64.
    </p>
    <p>
      XULRunner 31 does work with Windows XP and Windows 7, but there have been reports of failure on Windows 8. As a result, 24 is the official package.
    </p>
    <p>
      There is one known issue wherein an error message appears in the console: <code>1435372844657 addons.manager ERROR startup failed: [Exception... "Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIPrefBranch.setCharPref]" nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)" location: "JS frame :: resource://gre/modules/AddonManager.jsm :: AMI_startup :: line 645" data: no] Stack trace: AMI_startup()@resource://gre/modules/AddonManager.jsm:645 &lt; AMP_startup()@resource://gre/modules/AddonManager.jsm:2318 &lt; AMC_observe()@resource://gre/components/addonManager.js:55 &lt; &lt;file:unknown&gt;</code>
    </p>
    <p>
      However this appears to be benign. There is also currently an open bug on it. <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=466391" rel="nofollow" class="external free">https://bugs.eclipse.org/bugs/show_bug.cgi?id=466391</a>
    </p>
    <p>
      Neither WebKit nor None are supported on Windows.
    </p>
    <h3>
      <span class="mw-headline" id="Mac_OS_X">Mac OS X</span>
    </h3>
    <p>
      As of v2.6.3, XOWA uses WebKit for Mac OS X.
    </p>
    <p>
      The app package also includes XULRunner 31, but this is not enabled by default. The main issue is that mouse events are not relayed from XULrunner to SWT: <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=246830" rel="nofollow" class="external free">https://bugs.eclipse.org/bugs/show_bug.cgi?id=246830</a> . As a result, mouse hover does not work, and XOWA popups will not show.
    </p>
    <p>
      WebKit appears to be mostly functional, but it doesn't handle cursor changes. Hovering over a link won't change the cursor to a hand cursor. This appears to be an SWT issue, though the only known ticket is closed: <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=237562" rel="nofollow" class="external free">https://bugs.eclipse.org/bugs/show_bug.cgi?id=237562</a>
    </p>
    <p>
      The None mode is not supported on Mac OS X
    </p>
    <h3>
      <span class="mw-headline" id="Linux">Linux</span>
    </h3>
    <p>
      As of v2.6.5, XOWA uses XULRunner 24 with Linux.
    </p>
    <p>
      Unfortunately, XULRunner 31 is not yet implemented by SWT. See: <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=437700" rel="nofollow" class="external free">https://bugs.eclipse.org/bugs/show_bug.cgi?id=437700</a>
    </p>
    <p>
      Furthermore, XULRunner 24 requires GTK3 to be disabled since XULRunner is not yet ported to GTK3. See: <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=423870" rel="nofollow" class="external free">https://bugs.eclipse.org/bugs/show_bug.cgi?id=423870</a>
    </p>
    <p>
      XOWA accomplishes this by running the following in the xowa_linux_64.sh file "export SWT_GTK3=0 &amp;&amp; java -jar xowa_linux_64.jar"
    </p>
    <p>
      Neither WebKit nor None are supported on Linux.
    </p>
  
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