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authorMark Otto <[email protected]>2015-08-09 23:38:16 -0700
committerMark Otto <[email protected]>2015-08-09 23:38:16 -0700
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----
-layout: page
-title: Reboot
-group: components
----
-
-Part of Bootstrap's job is to provide an elegant, consistent, and simple baseline to build upon. We use Reboot, a collection of element-specific CSS changes in a single file, to kickstart that.
-
-Reboot builds upon Normalize, providing many HTML elements with somewhat opinionated styles using only element selectors. Additional styling is done only with classes. For example, we reboot some `<table>` styles for a simpler baseline and later provide `.table`, `.table-bordered`, and more.
-
-## Contents
-
-* Will be replaced with the ToC, excluding the "Contents" header
-{:toc}
-
-## Approach
-
-Here are our guidelines and reasons for choosing what to override in Reboot:
-
-- Update some browser default values to use `rem`s instead of `em`s for scalable component spacing.
-- Avoid `margin-top`. Vertical margins can collapse, yielding unexpected results. More importantly though, a single direction of `margin` is a simpler mental model.
-- For easier scaling across device sizes, block elements should use `rem`s for `margin`s.
-- Keep declarations of `font`-related properties to a minimal, using `inherit` whenever possible.
-
-## Page defaults
-
-The `<html>` and `<body>` elements are updated to provide better page-wide defaults. More specifically:
-
-- The `box-sizing` is globally set on every element—including `*:before` and `*after`, to `border-box`. This ensures that the declared width of element is never exceeded due to padding or border.
-- A base `font-size: 16px` is declared on the `<html>` and `font-size: 1rem` on the `<body>` for easy responsive type-scaling via media queryies.
-- The `<body>` also sets a global `font-family` and `line-height`. This is inherited later by some form elements to prevent font inconsistencies.
-- For safety, the `<body>` has a declared `background-color`, defaulting to `#fff`.
-
-## Headings and paragraphs
-
-All heading elements—e.g., `<h1>`—and `<p>` are reset to have their `margin-top` removed. Headings have `margin-bottom: .5rem` added and paragraphs `margin-bottom: 1rem` for easy spacing.
-
-<div class="bd-example">
-{% markdown %}
-# h1 heading
-Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
-
-## h2 heading
-Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
-
-### h3 heading
-Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
-
-#### h4 heading
-Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
-
-##### h5 heading
-Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
-
-###### h6 heading
-Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
-{% endmarkdown %}
-</div>
-
-## Lists
-
-All lists—`<ul>`, `<ol>`, and `<dl>`—have their `margin-top` removed and a `margin-bottom: 1rem`. Nested lists have no `margin-bottom`.
-
-<div class="bd-example">
-{% markdown %}
-* Lorem ipsum dolor sit amet
-* Consectetur adipiscing elit
-* Integer molestie lorem at massa
-* Facilisis in pretium nisl aliquet
-* Nulla volutpat aliquam velit
- * Phasellus iaculis neque
- * Purus sodales ultricies
- * Vestibulum laoreet porttitor sem
- * Ac tristique libero volutpat at
-* Faucibus porta lacus fringilla vel
-* Aenean sit amet erat nunc
-* Eget porttitor lorem
-
-1. Lorem ipsum dolor sit amet
-2. Consectetur adipiscing elit
-3. Integer molestie lorem at massa
-4. Facilisis in pretium nisl aliquet
-5. Nulla volutpat aliquam velit
-6. Faucibus porta lacus fringilla vel
-7. Aenean sit amet erat nunc
-8. Eget porttitor lorem
-{% endmarkdown %}
-</div>
-
-For simpler styling, clear hierarchy, and better spacing, description lists have updated `margin`s. `<dd>`s reset `margin-left` to `0` and add `margin-bottom: .5rem`. `<dt>`s are **bolded**.
-
-<div class="bd-example">
-{% markdown %}
-<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.</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>
-{% endmarkdown %}
-</div>
-
-## Preformatted text
-
-The `<pre>` element is reset to remove its `margin-top` and use `rem` units for its `margin-bottom`.
-
-<div class="bd-example">
-{% markdown %}
-<pre>
-.element {
- margin-bottom: 1rem;
-}
-</pre>
-{% endmarkdown %}
-</div>
-
-## Tables
-
-Tables are slightly adjusted to style `<caption>`s and ensure consistent `text-align` throughout. Additional changes for borders, padding, and more come with [the `.table` class](/components/tables/).
-
-<div class="bd-example">
- <table>
- <caption>
- This is an example table, and this is its caption to describe the contents.
- </caption>
- <thead>
- <tr>
- <th>Table heading</th>
- <th>Table heading</th>
- <th>Table heading</th>
- <th>Table heading</th>
- </tr>
- </thead>
- <tbody>
- <tr>
- <td>Table cell</td>
- <td>Table cell</td>
- <td>Table cell</td>
- <td>Table cell</td>
- </tr>
- <tr>
- <td>Table cell</td>
- <td>Table cell</td>
- <td>Table cell</td>
- <td>Table cell</td>
- </tr>
- <tr>
- <td>Table cell</td>
- <td>Table cell</td>
- <td>Table cell</td>
- <td>Table cell</td>
- </tr>
- </tbody>
- </table>
-</div>
-
-## Forms
-
-Various form elements have been rebooted for simpler base styles. Here are some of the most notable changes:
-
-- `<fieldset>`s have no borders, padding, or margin so they can be easily used as wrappers for individual inputs or groups of inputs.
-- `<legend>`s, like fieldsets, have also been restyled to be displayed as a heading of sorts.
-- `<label>`s are set to `display: inline-block` to allow `margin` to be applied.
-- `<input>`s, `<selects>`s, `<textareas>`s, and `<buttons>`s are mostly addressed by Normalize, but Reboot removes their `margin` and sets `line-height: inherit`, too.
-- `<textarea>`s are modified to only be resizeble vertically as horizontal resizing often "breaks" page layout.
-
-These changes, and more, are demonstrated below.
-
-<form class="bd-example">
- <fieldset>
- <legend>Example legend</legend>
-
- <p>
- <label for="input">Example input</label>
- <input type="text" id="input" placeholder="Example input">
- </p>
-
- <p>
- <label for="select">Example select</label>
- <select id="select">
- <option value="">Choose...</option>
- <optgroup label="Option group 1">
- <option value="">Option 1</option>
- <option value="">Option 2</option>
- <option value="">Option 3</option>
- </optgroup>
- <optgroup label="Option group 2">
- <option value="">Option 4</option>
- <option value="">Option 5</option>
- <option value="">Option 6</option>
- </optgroup>
- </select>
- </p>
-
- <p>
- <label>
- <input type="checkbox" value="">
- Check this checkbox
- </label>
- </p>
-
- <p>
- <label>
- <input type="radio" name="optionsRadios" id="optionsRadios1" value="option1" checked>
- Option one is this and that
- </label>
- <label>
- <input type="radio" name="optionsRadios" id="optionsRadios2" value="option2">
- Option two is something else that's also super long to demonstrate the wrapping of these fancy form controls.
- </label>
- <label>
- <input type="radio" name="optionsRadios" id="optionsRadios3" value="option3" disabled>
- Option three is disabled
- </label>
- </p>
-
- <p>
- <label for="textarea">Example textarea</label>
- <textarea id="textarea" rows="3"></textarea>
- </p>
-
- <p>
- <label for="time">Example temporal</label>
- <input type="datetime" id="time">
- </p>
-
- <p>
- <label for="output">Example output</label>
- <output name="result" id="output">100</output>
- </p>
-
- <p>
- <button type="submit">Button submit</button>
- <input type="submit" value="Input submit button">
- <input type="button" value="Input button">
- </p>
-
- <p>
- <button type="submit" disabled>Button submit</button>
- <input type="submit" value="Input submit button" disabled>
- <input type="button" value="Input button" disabled>
- </p>
- </fieldset>
-</form>
-
-## Misc elements
-
-### Address
-
-The `<address>` element is updated to reset the browser default `font-style` from `italic` to `normal`. `line-height` is also now inherited, and `margin-bottom: 1rem` has been added. `<address>`s are for presenting contact information for the nearest ancestor (or an entire body of work). Preserve formatting by ending lines with `<br>`.
-
-<div class="bd-example">
- <address>
- <strong>Twitter, Inc.</strong><br>
- 1355 Market St, Suite 900<br>
- San Francisco, CA 94103<br>
- <abbr title="Phone">P:</abbr> (123) 456-7890
- </address>
-
- <address>
- <strong>Full Name</strong><br>
- <a href="mailto:#">[email protected]</a>
- </address>
-</div>
-
-### Blockquote
-
-The default `margin` on blockquotes is `1em 40px`, so we reset that to `0 0 1rem` for something more consistent with other elements.
-
-<div class="bd-example">
- <blockquote>
- <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
- <footer>Someone famous in <cite title="Source Title">Source Title</cite></footer>
- </blockquote>
-</div>
-
-### Inline elements
-
-The `<abbr>` element receives basic styling to make it stand the amongst paragraph text.
-
-<div class="bd-example">
- Nulla <abbr title="attribute">attr</abbr> vitae elit libero, a pharetra augue.
-</div>