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317 lines
9 KiB
Markdown
317 lines
9 KiB
Markdown
---
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layout: page
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title: Reboot
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---
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All of Bootstrap's element-specific CSS changes are part of what we call the Reboot, a single CSS file of simple overrides.
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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.
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## Approach
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Here are our guidelines and reasons for choosing what to override in Reboot:
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- Use `rem`s and `em`s for units, nothing else.
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- Avoid `margin-top`. Vertical margins can collapse, yielding unexpected results. More importantly though, a single direction of `margin` is a simpler mental model.
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- For easier scaling across device sizes, block elements should use `rem`s for `margin`s.
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- Keep declarations of `font`-related properties to a minimal, using `inherit` whenever possible.
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## Page defaults
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The `<html>` and `<body>` elements are updated to provide better page-wide defaults. More specifically:
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- 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.
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- 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.
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- The `<body>` also sets a global `font-family` and `line-height`. This is inherited later by some form elements to prevent font inconsistencies.
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- For safety, the `<body>` has a declared `background-color`, defaulting to `#fff`.
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## Headings and paragraphs
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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.
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<div class="bd-example">
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{% markdown %}
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# h1 heading
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Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
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## h2 heading
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Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
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### h3 heading
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Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
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#### h4 heading
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Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
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##### h5 heading
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Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
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###### h6 heading
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Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
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{% endmarkdown %}
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</div>
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## Lists
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All lists—`<ul>`, `<ol>`, and `<dl>`—have their `margin-top` removed and a `margin-bottom: 1rem`. Nested lists have no `margin-bottom`.
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<div class="bd-example">
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{% markdown %}
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* Lorem ipsum dolor sit amet
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* Consectetur adipiscing elit
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* Integer molestie lorem at massa
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* Facilisis in pretium nisl aliquet
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* Nulla volutpat aliquam velit
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* Phasellus iaculis neque
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* Purus sodales ultricies
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* Vestibulum laoreet porttitor sem
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* Ac tristique libero volutpat at
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* Faucibus porta lacus fringilla vel
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* Aenean sit amet erat nunc
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* Eget porttitor lorem
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1. Lorem ipsum dolor sit amet
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2. Consectetur adipiscing elit
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3. Integer molestie lorem at massa
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4. Facilisis in pretium nisl aliquet
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5. Nulla volutpat aliquam velit
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6. Faucibus porta lacus fringilla vel
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7. Aenean sit amet erat nunc
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8. Eget porttitor lorem
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{% endmarkdown %}
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</div>
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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**.
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<div class="bd-example">
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{% markdown %}
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<dl>
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<dt>Description lists</dt>
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<dd>A description list is perfect for defining terms.</dd>
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<dt>Euismod</dt>
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<dd>Vestibulum id ligula porta felis euismod semper eget lacinia odio sem.</dd>
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<dd>Donec id elit non mi porta gravida at eget metus.</dd>
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<dt>Malesuada porta</dt>
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<dd>Etiam porta sem malesuada magna mollis euismod.</dd>
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</dl>
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{% endmarkdown %}
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</div>
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## Tables
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Tables are slightly adjusted to style `<caption>`s and ensure consistent `text-align` throughout.
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<div class="bd-example">
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<table>
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<caption>
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This is an example table, and this is it's caption to describe the contents.
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</caption>
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<thead>
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<tr>
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<th>Table heading</th>
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<th>Table heading</th>
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<th>Table heading</th>
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<th>Table heading</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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</tr>
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<tr>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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</tr>
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<tr>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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</tr>
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</tbody>
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</table>
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</div>
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## Code blocks
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The `<pre>` element is reset to remove its `margin-top` and use `rem` units for its `margin-bottom`.
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<div class="bd-example">
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{% markdown %}
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<pre>
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.element {
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margin-bottom: 1rem;
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}
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</pre>
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{% endmarkdown %}
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</div>
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## Inline elements
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<div class="bd-example">
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{% markdown %}
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Praesent commodo cursus magna, vel scelerisque nisl consectetur et. For example, `<section>` should be wrapped as inline. Nulla <abbr title="attribute">attr</abbr> vitae elit libero, a pharetra augue. Donec id elit non mi porta gravida at eget metus.
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{% endmarkdown %}
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</div>
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<h1>Address</h1>
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<address>
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<strong>Twitter, Inc.</strong><br>
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795 Folsom Ave, Suite 600<br>
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San Francisco, CA 94107<br>
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<abbr title="Phone">P:</abbr> (123) 456-7890
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</address>
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<address>
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<strong>Full Name</strong><br>
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<a href="mailto:#">first.last@example.com</a>
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</address>
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<hr>
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<h1>Blockquote</h1>
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<blockquote>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
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<footer>Someone famous in <cite title="Source Title">Source Title</cite></footer>
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</blockquote>
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<hr>
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<h1>Tables</h1>
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<table>
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<caption>
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This is an example table, and this is it's caption to describe the contents.
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</caption>
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<thead>
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<tr>
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<th>Table heading</th>
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<th>Table heading</th>
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<th>Table heading</th>
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<th>Table heading</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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</tr>
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<tr>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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</tr>
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<tr>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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<td>Table cell</td>
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</tr>
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</tbody>
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</table>
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<hr>
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<h1>Forms</h1>
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<form>
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<fieldset>
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<legend>Example legend</legend>
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<p>
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<label for="input">Example input</label>
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<input type="text" id="input" placeholder="Example input">
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</p>
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<p>
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<label for="select">Example select</label>
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<select id="select">
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<option value="">Choose...</option>
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<optgroup label="Option group 1">
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<option value="">Option 1</option>
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<option value="">Option 2</option>
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<option value="">Option 3</option>
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</optgroup>
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<optgroup label="Option group 2">
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<option value="">Option 4</option>
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<option value="">Option 5</option>
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<option value="">Option 6</option>
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</optgroup>
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</select>
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</p>
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<formgroup>
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<label>
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<input type="checkbox" value="">
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Check this checkbox
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</label>
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</formgroup>
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<formgroup>
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<label>
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<input type="radio" name="optionsRadios" id="optionsRadios1" value="option1" checked>
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Option one is this and that
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</label>
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<label>
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<input type="radio" name="optionsRadios" id="optionsRadios2" value="option2">
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Option two is something else that's also super long to demonstrate the wrapping of these fancy form controls.
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</label>
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<label>
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<input type="radio" name="optionsRadios" id="optionsRadios3" value="option3" disabled>
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Option three is disabled
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</label>
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</formgroup>
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<p>
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<label for="textarea">Example textarea</label>
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<textarea id="example" rows="3"></textarea>
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</p>
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<p>
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<label for="file">Example file</label>
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<input type="file">
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</p>
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<p>
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<label for="progress">Example progress bar</label>
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<progress value="25" min="0" max="100"></progress>
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</p>
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<p>
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<label for="range">Example range</label>
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<input type="range">
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</p>
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<p>
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<label for="time">Example temporal</label>
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<input type="date">
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</p>
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<p>
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<button type="submit">Button submit</button>
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<input type="submit" value="Input submit button">
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<input type="button" value="Input button">
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</p>
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<p>
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<button type="submit" disabled>Button submit</button>
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<input type="submit" value="Input submit button" disabled>
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<input type="button" value="Input button" disabled>
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</p>
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</fieldset>
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</form>
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