<pclass="lead">Get the lowdown on the key pieces of Bootstrap's infrastructure, including our approach to better, faster, stronger web development.</p>
<h3>Requires HTML5 doctype</h3>
<p>Bootstrap makes use of certain HTML elements and CSS properties that require the use of the HTML5 doctype. Include it at the beginning of all your projects.</p>
<preclass="prettyprint linenums">
<!DOCTYPE html>
<html lang="en">
...
</html>
</pre>
<h3>Mobile first</h3>
<p>With Bootstrap 2, we added optional mobile friendly styles for key aspects of the framework. With Bootstrap 3, we've rewritten the project to be mobile friendly from the start. Instead of adding on optional mobile styles, they're baked right into the core. In fact, <strong>Bootstrap is mobile first</strong>. Mobile first styles can be found throughout the entire library instead of in separate files.</p>
<p>To ensure proper rendering and touch zooming, <strong>add the viewport meta tag</strong> to your <code><head></code>.</p>
<p>Bootstrap sets basic global display, typography, and link styles. Specifically, we:</p>
<ul>
<li>Remove <code>margin</code> on the body</li>
<li>Set <code>background-color: white;</code> on the <code>body</code></li>
<li>Use the <code>@font-family-base</code>, <code>@font-size-base</code>, and <code>@line-height-base</code> attributes as our typographic base</li>
<li>Set the global link color via <code>@link-color</code> and apply link underlines only on <code>:hover</code></li>
</ul>
<p>These styles can be found within <strong>scaffolding.less</strong>.</p>
<h3>Normalize reset</h3>
<p>For improved cross-browser rendering, we use <ahref="http://necolas.github.com/normalize.css/"target="_blank">Normalize</a>, a project by <ahref="http://twitter.com/necolas"target="_blank">Nicolas Gallagher</a> and <ahref="http://twitter.com/jon_neal"target="_blank">Jonathan Neal</a>.</p>
<p>All HTML headings, <code><h1></code> through <code><h6></code> are available.</p>
<divclass="bs-docs-example">
<h1>h1. Heading 1</h1>
<h2>h2. Heading 2</h2>
<h3>h3. Heading 3</h3>
<h4>h4. Heading 4</h4>
<h5>h5. Heading 5</h5>
<h6>h6. Heading 6</h6>
</div>
<!-- Body copy -->
<h2id="body-copy">Body copy</h2>
<p>Bootstrap's global default <code>font-size</code> is <strong>14px</strong>, with a <code>line-height</code> of <strong>20px</strong>. This is applied to the <code><body></code> and all paragraphs. In addition, <code><p></code> (paragraphs) receive a bottom margin of half their line-height (10px by default).</p>
<divclass="bs-docs-example">
<p>Nullam quis risus eget urna mollis ornare vel eu leo. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Nullam id dolor id nibh ultricies vehicula.</p>
<p>Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec ullamcorper nulla non metus auctor fringilla. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Donec ullamcorper nulla non metus auctor fringilla.</p>
<p>Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
<p>The typographic scale is based on two LESS variables in <strong>variables.less</strong>: <code>@font-size-base</code> and <code>@line-height-base</code>. The first is the base font-size used throughout and the second is the base line-height. We use those variables and some simple math to create the margins, paddings, and line-heights of all our type and more. Customize them and Bootstrap adapts.</p>
<!-- Emphasis -->
<h2id="emphasis">Emphasis</h2>
<p>Make use of HTML's default emphasis tags with lightweight styles.</p>
<h3><code><small></code></h3>
<p>For de-emphasizing inline or blocks of text, <small>use the small tag.</small></p>
<divclass="bs-docs-example">
<p><small>This line of text is meant to be treated as fine print.</small></p>
</div>
<preclass="prettyprint">
<p>
<small>This line of text is meant to be treated as fine print.</small>
</p>
</pre>
<h3>Bold</h3>
<p>For emphasizing a snippet of text with a heavier font-weight.</p>
<divclass="bs-docs-example">
<p>The following snippet of text is <strong>rendered as bold text</strong>.</p>
</div>
<preclass="prettyprint"><strong>rendered as bold text</strong></pre>
<h3>Italics</h3>
<p>For emphasizing a snippet of text with italics.</p>
<divclass="bs-docs-example">
<p>The following snippet of text is <em>rendered as italicized text</em>.</p>
</div>
<preclass="prettyprint"><em>rendered as italicized text</em></pre>
<p>Feel free to use <code><b></code> and <code><i></code> in HTML5. <code><b></code> is meant to highlight words or phrases without conveying additional importance while <code><i></code> is mostly for voice, technical terms, etc.</p>
<h3>Alignment classes</h3>
<p>Easily realign text to components with text alignment classes.</p>
<p>Convey meaning through color with a handful of emphasis utility classes.</p>
<divclass="bs-docs-example">
<pclass="muted">Fusce dapibus, tellus ac cursus commodo, tortor mauris nibh.</p>
<pclass="text-warning">Etiam porta sem malesuada magna mollis euismod.</p>
<pclass="text-error">Donec ullamcorper nulla non metus auctor fringilla.</p>
<pclass="text-success">Duis mollis, est non commodo luctus, nisi erat porttitor ligula.</p>
</div>
<preclass="prettyprint linenums">
<p class="muted">Fusce dapibus, tellus ac cursus commodo, tortor mauris nibh.</p>
<p class="text-warning">Etiam porta sem malesuada magna mollis euismod.</p>
<p class="text-error">Donec ullamcorper nulla non metus auctor fringilla.</p>
<p class="text-success">Duis mollis, est non commodo luctus, nisi erat porttitor ligula.</p>
</pre>
<!-- Abbreviations -->
<h2id="abbreviations">Abbreviations</h2>
<p>Stylized implementation of HTML's <code><abbr></code> element for abbreviations and acronyms to show the expanded version on hover. Abbreviations with a <code>title</code> attribute have a light dotted bottom border and a help cursor on hover, providing additional context on hover.</p>
<h3><code><abbr></code></h3>
<p>For expanded text on long hover of an abbreviation, include the <code>title</code> attribute.</p>
<divclass="bs-docs-example">
<p>An abbreviation of the word attribute is <abbrtitle="attribute">attr</abbr>.</p>
<p>For quoting blocks of content from another source within your document.</p>
<h3>Default blockquote</h3>
<p>Wrap <code><blockquote></code> around any <abbrtitle="HyperText Markup Language">HTML</abbr> as the quote. For straight quotes we recommend a <code><p></code>.</p>
<divclass="bs-docs-example">
<blockquote>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
</blockquote>
</div>
<preclass="prettyprint linenums">
<blockquote>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
</blockquote>
</pre>
<h3>Blockquote options</h3>
<p>Style and content changes for simple variations on a standard blockquote.</p>
<h4>Naming a source</h4>
<p>Add <code><small></code> tag for identifying the source. Wrap the name of the source work in <code><cite></code>.</p>
<divclass="bs-docs-example">
<blockquote>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
<small>Someone famous in <citetitle="Source Title">Source Title</cite></small>
</blockquote>
</div>
<preclass="prettyprint linenums">
<blockquote>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
<small>Someone famous <cite title="Source Title">Source Title</cite></small>
</blockquote>
</pre>
<h4>Alternate displays</h4>
<p>Use <code>.pull-right</code> for a floated, right-aligned blockquote.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
<small>Someone famous in <citetitle="Source Title">Source Title</cite></small>
</blockquote>
</div>
<preclass="prettyprint linenums">
<blockquote class="pull-right">
...
</blockquote>
</pre>
<!-- Lists -->
<h2id="lists">Lists</h2>
<h3>Unordered</h3>
<p>A list of items in which the order does <em>not</em> explicitly matter.</p>
<divclass="bs-docs-example">
<ul>
<li>Lorem ipsum dolor sit amet</li>
<li>Consectetur adipiscing elit</li>
<li>Integer molestie lorem at massa</li>
<li>Facilisis in pretium nisl aliquet</li>
<li>Nulla volutpat aliquam velit
<ul>
<li>Phasellus iaculis neque</li>
<li>Purus sodales ultricies</li>
<li>Vestibulum laoreet porttitor sem</li>
<li>Ac tristique libero volutpat at</li>
</ul>
</li>
<li>Faucibus porta lacus fringilla vel</li>
<li>Aenean sit amet erat nunc</li>
<li>Eget porttitor lorem</li>
</ul>
</div>
<preclass="prettyprint linenums">
<ul>
<li>...</li>
</ul>
</pre>
<h3>Ordered</h3>
<p>A list of items in which the order <em>does</em> explicitly matter.</p>
<divclass="bs-docs-example">
<ol>
<li>Lorem ipsum dolor sit amet</li>
<li>Consectetur adipiscing elit</li>
<li>Integer molestie lorem at massa</li>
<li>Facilisis in pretium nisl aliquet</li>
<li>Nulla volutpat aliquam velit</li>
<li>Faucibus porta lacus fringilla vel</li>
<li>Aenean sit amet erat nunc</li>
<li>Eget porttitor lorem</li>
</ol>
</div>
<preclass="prettyprint linenums">
<ol>
<li>...</li>
</ol>
</pre>
<h3>Unstyled</h3>
<p>Remove the default <code>list-style</code> and left padding on list items (immediate children only).</p>
<divclass="bs-docs-example">
<ulclass="list-unstyled">
<li>Lorem ipsum dolor sit amet</li>
<li>Consectetur adipiscing elit</li>
<li>Integer molestie lorem at massa</li>
<li>Facilisis in pretium nisl aliquet</li>
<li>Nulla volutpat aliquam velit
<ul>
<li>Phasellus iaculis neque</li>
<li>Purus sodales ultricies</li>
<li>Vestibulum laoreet porttitor sem</li>
<li>Ac tristique libero volutpat at</li>
</ul>
</li>
<li>Faucibus porta lacus fringilla vel</li>
<li>Aenean sit amet erat nunc</li>
<li>Eget porttitor lorem</li>
</ul>
</div>
<preclass="prettyprint linenums">
<ul class="list-unstyled">
<li>...</li>
</ul>
</pre>
<h3>Inline</h3>
<p>Place all list items on a single line with <code>inline-block</code> and some light padding.</p>
<divclass="bs-docs-example">
<ulclass="list-inline">
<li>Lorem ipsum</li>
<li>Phasellus iaculis</li>
<li>Nulla volutpat</li>
</ul>
</div>
<preclass="prettyprint linenums">
<ul class="list-inline">
<li>...</li>
</ul>
</pre>
<h3>Description</h3>
<p>A list of terms with their associated descriptions.</p>
<divclass="bs-docs-example">
<dl>
<dt>Description lists</dt>
<dd>A description list is perfect for defining terms.</dd>
<dt>Euismod</dt>
<dd>Vestibulum id ligula porta felis euismod semper eget lacinia odio sem nec elit.</dd>
<dd>Donec id elit non mi porta gravida at eget metus.</dd>
<dt>Malesuada porta</dt>
<dd>Etiam porta sem malesuada magna mollis euismod.</dd>
</dl>
</div>
<preclass="prettyprint linenums">
<dl>
<dt>...</dt>
<dd>...</dd>
</dl>
</pre>
<h4>Horizontal description</h4>
<p>Make terms and descriptions in <code><dl></code> line up side-by-side.</p>
<divclass="bs-docs-example">
<dlclass="dl-horizontal">
<dt>Description lists</dt>
<dd>A description list is perfect for defining terms.</dd>
<dt>Euismod</dt>
<dd>Vestibulum id ligula porta felis euismod semper eget lacinia odio sem nec elit.</dd>
<dd>Donec id elit non mi porta gravida at eget metus.</dd>
<dt>Malesuada porta</dt>
<dd>Etiam porta sem malesuada magna mollis euismod.</dd>
<dt>Felis euismod semper eget lacinia</dt>
<dd>Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</dd>
</dl>
</div>
<preclass="prettyprint linenums">
<dl class="dl-horizontal">
<dt>...</dt>
<dd>...</dd>
</dl>
</pre>
<h5>Auto-truncating</h5>
<p>
Horizontal description lists will truncate terms that are too long to fit in the left column fix <code>text-overflow</code>. In narrower viewports, they will change to the default stacked layout.
<p>The default Bootstrap grid system utilizes <strong>12 columns</strong>, making for a 940px wide container without <ahref="./scaffolding.html#responsive">responsive features</a> enabled. With the responsive CSS file added, the grid adapts to be 724px and 1170px wide depending on your viewport. Below 767px viewports, the columns become fluid and stack vertically.</p>
<divclass="bs-docs-grid">
<divclass="row show-grid">
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
<divclass="span1">1</div>
</div>
<divclass="row show-grid">
<divclass="span4">4</div>
<divclass="span4">4</div>
<divclass="span4">4</div>
</div>
<divclass="row show-grid">
<divclass="span6">6</div>
<divclass="span6">6</div>
</div>
</div>
<h3>Basic grid HTML</h3>
<p>For a simple two column layout, create a <code>.row</code> and add the appropriate number of <code>.span*</code> columns. As this is a 12-column grid, each <code>.span*</code> spans a number of those 12 columns, and should always add up to 12 for each row (or the number of columns in the parent).</p>
<preclass="prettyprint linenums">
<div class="row">
<div class="span4">...</div>
<div class="span8">...</div>
</div>
</pre>
<p>Given this example, we have <code>.span4</code> and <code>.span8</code>, making for 12 total columns and a complete row.</p>
<h2>Offsetting columns</h2>
<p>Move columns to the right using <code>.offset*</code> classes. Each class increases the left margin of a column by a whole column. For example, <code>.offset4</code> moves <code>.span4</code> over four columns.</p>
<divclass="bs-docs-grid">
<divclass="row show-grid">
<divclass="span4">4</div>
<divclass="span4 offset4">4 offset 4</div>
</div><!-- /row -->
<divclass="row show-grid">
<divclass="span3 offset3">3 offset 3</div>
<divclass="span3 offset3">3 offset 3</div>
</div><!-- /row -->
<divclass="row show-grid">
<divclass="span6 offset6">6 offset 6</div>
</div><!-- /row -->
</div>
<preclass="prettyprint linenums">
<div class="row">
<div class="span4">...</div>
<div class="span4 offset4">...</div>
</div>
</pre>
<h2>Nesting columns</h2>
<p>To nest your content with the default grid, add a new <code>.row</code> and set of <code>.span*</code> columns within an existing <code>.span*</code> column. Nested rows should include a set of columns that add up to 12.</p>
<p>For basic styling—light padding and only horizontal dividers—add the base class <code>.table</code> to any <code><table></code>.</p>
<divclass="bs-docs-example">
<tableclass="table">
<thead>
<tr>
<th>#</th>
<th>First Name</th>
<th>Last Name</th>
<th>Username</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>Mark</td>
<td>Otto</td>
<td>@mdo</td>
</tr>
<tr>
<td>2</td>
<td>Jacob</td>
<td>Thornton</td>
<td>@fat</td>
</tr>
<tr>
<td>3</td>
<td>Larry</td>
<td>the Bird</td>
<td>@twitter</td>
</tr>
</tbody>
</table>
</div><!-- /example -->
<preclass="prettyprint linenums">
<table class="table">
…
</table>
</pre>
<h2>Optional classes</h2>
<p>Add any of the following classes to the <code>.table</code> base class.</p>
<h3><code>.table-striped</code></h3>
<p>Adds zebra-striping to any table row within the <code><tbody></code> via the <code>:nth-child</code> CSS selector (not available in IE8).</p>
<p>Right align labels and float them to the left to make them appear on the same line as controls. Requires the most markup changes from a default form:</p>
<ul>
<li>Add <code>.form-horizontal</code> to the form</li>
<li>Wrap labels and controls in <code>.control-group</code></li>
<li>Add <code>.control-label</code> to the label</li>
<li>Wrap any associated controls in <code>.controls</code> for proper alignment</li>
<h2id="forms-controls">Supported form controls</h2>
<p>Examples of standard form controls supported in an example form layout.</p>
<h3>Inputs</h3>
<p>Most common form control, text-based input fields. Includes support for all HTML5 types: text, password, datetime, datetime-local, date, month, time, week, number, email, url, search, tel, and color.</p>
<p>Requires the use of a specified <code>type</code> at all times.</p>
<p>Use the default option or specify a <code>multiple="multiple"</code> to show multiple options at once.</p>
<formclass="bs-docs-example">
<select>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
<br>
<selectmultiple="multiple">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</form>
<preclass="prettyprint linenums">
<select>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
<select multiple="multiple">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</pre>
<h2>Form control states</h2>
<p>Provide feedback to users or visitors with basic feedback states on form controls and labels.</p>
<h3id="forms-input-focus">Input focus</h3>
<p>We remove the default <code>outline</code> styles on some form controls and apply a <code>box-shadow</code> in its place for <code>:focus</code>.</p>
<formclass="bs-docs-example form-inline">
<inputclass="focused"id="focusedInput"type="text"value="This is focused...">
</form>
<preclass="prettyprint linenums">
<input id="focusedInput" type="text" value="This is focused...">
</pre>
<h3id="forms-invalid-inputs">Invalid inputs</h3>
<p>Style inputs via default browser functionality with <code>:invalid</code>. Specify a <code>type</code>, add the <code>required</code> attribute if the field is not optional, and (if applicable) specify a <code>pattern</code>.</p>
<p>This is not available in versions of Internet Explorer 7-9 due to lack of support for CSS pseudo selectors.</p>
<p>Add the <code>disabled</code> attribute to a <code><fieldset></code> to disable all the controls within the <code><fieldset></code> at once. Link buttons (with the <code><a></code> element) will be aesthetically disabled, but you will need custom JavaScript to disable their behavior.</p>
<p>Bootstrap includes validation styles for error, warning, info, and success messages. To use:</p>
<ul>
<li>Add <code>.has-warning</code>, <code>.has-error</code>, or <code>.has-success</code> to the parent element</li>
<li>Add .input-with-feedback to the field(s) in question</li>
</ul>
<p>Validation styles are applied on a per-input basis. With horizontal forms, the <code><label class="control-label"></code> will always be styled.</p>
<formclass="bs-docs-example form-horizontal">
<divclass="control-group has-warning">
<labelclass="control-label"for="inputWarning">Input with warning</label>
<h2id="forms-extending">Extending form controls</h2>
<p>Adding on top of existing browser controls, Bootstrap includes other useful form components.</p>
<h3>Input groups</h3>
<p>Add text or buttons before, after, or on both sides of any text-based input. Use <code>.input-group</code> with a <code>.add-on</code> to prepend or append elements to an <code><input></code>.</p>
<p>Avoid using <code><select></code> elements here as they cannot be fully styled in WebKit browsers.</p>
<p>Buttons in input groups are a bit different and require one extra level of nesting. Instead of <code>.input-group-addon</code>, you'll need to use <code>.input-group-btn</code> to wrap the buttons. This is required due to default browser styles that cannot be overridden.</p>
<p>If you need multiple inputs on the same line, wrap them in the standard grid markup (with <code>.row</code> and <code>.span*</code> classes). Each input should have it's own column and will expand to fill the available width automatically.</p>
<p>Present data in a form that's not editable without using actual form markup.</p>
<formclass="bs-docs-example">
<spanclass="input-xlarge uneditable-input">Some value here</span>
</form>
<preclass="prettyprint linenums">
<span class="input-xlarge uneditable-input">Some value here</span>
</pre>
<h3>Form actions</h3>
<p>End a form with a group of actions (buttons). When placed within a <code>.form-horizontal</code>, the buttons will automatically indent to line up with the form controls.</p>
<p>Inline and block level support for help text that appears around form controls.</p>
<h4>Inline help</h4>
<formclass="bs-docs-example form-inline">
<inputtype="text"><spanclass="help-inline">Inline help text</span>
</form>
<preclass="prettyprint linenums">
<input type="text"><span class="help-inline">Inline help text</span>
</pre>
<h4>Block help</h4>
<formclass="bs-docs-example form-inline">
<inputtype="text">
<spanclass="help-block">A longer block of help text that breaks onto a new line and may extend beyond one line.</span>
</form>
<preclass="prettyprint linenums">
<input type="text"><span class="help-block">A longer block of help text that breaks onto a new line and may extend beyond one line.</span>
<p>Button styles can be applied to anything with the <code>.btn</code> class applied. However, typically you'll want to apply these to only <code><a></code> and <code><button></code> elements for the best rendering.</p>
<td>Deemphasize a button by making it look like a link while maintaining button behavior</td>
</tr>
</tbody>
</table>
<h4>Cross browser compatibility</h4>
<p>IE9 doesn't crop background gradients on rounded corners, so we remove it. Related, IE9 jankifies disabled <code>button</code> elements, rendering text gray with a nasty text-shadow that we cannot fix.</p>
<h2>Button sizes</h2>
<p>Fancy larger or smaller buttons? Add <code>.btn-large</code>, <code>.btn-small</code>, or <code>.btn-mini</code> for additional sizes.</p>
We use <code>.disabled</code> as a utility class here, similar to the common <code>.active</code> class, so no prefix is required. Also, this class is only for aesthetic; you must use custom JavaScript to disable links here.
</p>
<h3>Button element</h3>
<p>Add the <code>disabled</code> attribute to <code><button></code> buttons.</p>
<p>As a best practice, try to match the element for your context to ensure matching cross-browser rendering. If you have an <code>input</code>, use an <code><input type="submit"></code> for your button.</p>
<h1>Icons font <small>by <ahref="http://glyphicons.com"target="_blank">Glyphicons</a></small></h1>
</div>
<h2>Included glyphs</h2>
<p>Bootstrap comes with all 160 of <ahref="http://glyphicons.com"target="_blank">Glyphicons</a> Halflings set, all available in font formats for easy coloring, sizing, and placement.</p>
<p><ahref="http://glyphicons.com/">Glyphicons</a> Halflings are normally not available for free, but an arrangement between Bootstrap and the Glyphicons creator have made this possible at no cost to you as developers. As a thank you, we ask you to include an optional link back to <ahref="http://glyphicons.com/">Glyphicons</a> whenever practical.</p>
<h2>How to use</h2>
<p>Add the appropriate class to any inline element. All icon classes are prefixed with <code>glyphicon-</code> for easy styling. To use, place the following code just about anywhere:</p>
<preclass="prettyprint linenums">
<i class="glyphicon-search"></i>
</pre>
<p>Want to change the icon color? Just change the <code>color</code> of the parent element.</p>
<p>When using beside strings of text, as in buttons or nav links, be sure to leave a space after the icon for proper spacing.</p>
<h2>Icon examples</h2>
<p>Use them in buttons, button groups for a toolbar, navigation, or prepended form inputs.</p>
<p>Use on a limited basis and avoid creating entirely different versions of the same site. Instead, use them to complement each device's presentation. Responsive utilities should not be used with tables, and as such are not supported.</p>
<h3>Responsive utilities test case</h3>
<p>Resize your browser or load on different devices to test the above classes.</p>
<h4>Visible on...</h4>
<p>Green checkmarks indicate that class is visible in your current viewport.</p>
