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    <head>
      <base href="https://bugs.webkit.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - ASSERTION FAILED: startIndex &lt;= endIndex in WebCore::ApplyBlockElementCommand::doApply"
   href="https://bugs.webkit.org/show_bug.cgi?id=151111">151111</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>ASSERTION FAILED: startIndex &lt;= endIndex in WebCore::ApplyBlockElementCommand::doApply
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Local Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>HTML Editing
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>rhodovan.u-szeged&#64;partner.samsung.com
          </td>
        </tr>

        <tr>
          <th>Blocks</th>
          <td>116980
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=265201" name="attach_265201" title="Test">attachment 265201</a> <a href="attachment.cgi?id=265201&amp;action=edit" title="Test">[details]</a></span>
Test

Load the attached test with debug MiniBrowser:

a&lt;font&gt;&lt;/font&gt;&lt;li&gt;&lt;/li&gt;
&lt;li&gt;&lt;/li&gt;
&lt;embed&gt;&lt;/embed&gt;a
&lt;base contenteditable=&quot;false&quot;&gt;&lt;base&gt;a
&lt;time hidden&gt;&lt;sub contenteditable=&quot;false&quot;&gt;&lt;/sub&gt;&lt;/time&gt;
a
&lt;style&gt;
* {
    display:inline-grid-grid;
}
&lt;/style&gt;
&lt;script&gt;
    document.designMode = 'on';
    document.execCommand(&quot;selectAll&quot;);
    document.execCommand(&quot;indent&quot;);
    document.execCommand(&quot;indent&quot;);
&lt;/script&gt;


OS: Ubuntu 15.04 x86_64
Checked build: debug EFL
Checked version: 29ae33c


Backtrace:

ASSERTION FAILED: startIndex &lt;= endIndex
../../Source/WebCore/editing/ApplyBlockElementCommand.cpp(92) : virtual void WebCore::ApplyBlockElementCommand::doApply()
1   0x7fb168b7489f WTFCrash
2   0x7fb16ff90e59 WebCore::ApplyBlockElementCommand::doApply()
3   0x7fb16ffa6f4c WebCore::CompositeEditCommand::apply()
4   0x7fb16ffa6cfd WebCore::applyCommand(WTF::PassRefPtr&lt;WebCore::CompositeEditCommand&gt;)
5   0x7fb16ee0b3a6
6   0x7fb16ee0f59e WebCore::Editor::Command::execute(WTF::String const&amp;, WebCore::Event*) const
7   0x7fb16ecb3d39 WebCore::Document::execCommand(WTF::String const&amp;, bool, WTF::String const&amp;)
8   0x7fb1703e622d WebCore::jsDocumentPrototypeFunctionExecCommand(JSC::ExecState*)
9   0x7fb10b7ff0c8
Aborted (core dumped)

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fe901d648a4 in WTFCrash () at ../../Source/WTF/wtf/Assertions.cpp:321
321     *(int *)(uintptr_t)0xbbadbeef = 0;
(gdb) bt
#0  0x00007fe901d648a4 in WTFCrash () at ../../Source/WTF/wtf/Assertions.cpp:321
#1  0x00007fe909180e59 in WebCore::ApplyBlockElementCommand::doApply (this=0x7fe8e92dc318) at ../../Source/WebCore/editing/ApplyBlockElementCommand.cpp:92
#2  0x00007fe909196f4c in WebCore::CompositeEditCommand::apply (this=0x7fe8e92dc318) at ../../Source/WebCore/editing/CompositeEditCommand.cpp:227
#3  0x00007fe909196cfd in WebCore::applyCommand (command=...) at ../../Source/WebCore/editing/CompositeEditCommand.cpp:186
#4  0x00007fe907ffb3a6 in WebCore::executeIndent (frame=...) at ../../Source/WebCore/editing/EditorCommand.cpp:456
#5  0x00007fe907fff59e in WebCore::Editor::Command::execute (this=0x7ffdf0ce66f0, parameter=..., triggeringEvent=0x0)
    at ../../Source/WebCore/editing/EditorCommand.cpp:1703
#6  0x00007fe907ea3d39 in WebCore::Document::execCommand (this=0x7fe8e9024940, commandName=..., userInterface=false, value=...)
    at ../../Source/WebCore/dom/Document.cpp:4657
#7  0x00007fe9095d622d in WebCore::jsDocumentPrototypeFunctionExecCommand (state=0x7ffdf0ce67c0) at DerivedSources/WebCore/JSDocument.cpp:5066
#8  0x00007fe8a3fff0c8 in ?? ()
#9  0x00007ffdf0ce6830 in ?? ()
#10 0x00007fe901d0d036 in llint_entry () from webkit/WebKitBuild/Debug/lib/libjavascriptcore_efl.so.1</pre>
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