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---
Massive cleanup - Simpler main nav on all pages - Back to purple masthead on homepage instead of dark graphite - Active link styles on the main nav - Cleaned up sidebar nav - New docs layout name - Homepage copy edits - Updated bright purple docs color
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layout: docs
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title: Reboot
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description: Reboot, a collection of element-specific CSS changes in a single file, kickstart Bootstrap to provide an elegant, consistent, and simple baseline to build upon.
docs rearrange
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group: content
Release v4.4.0 (#29735)
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redirect_from: "/docs/4.4/content/"
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toc: true
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---
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## Approach
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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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Here are our guidelines and reasons for choosing what to override in Reboot:
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- Update some browser default values to use `rem`s instead of `em`s for scalable component spacing.
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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.
- 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 minimum, 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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Use CSS3 pseudo elements in documentation
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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.
Fix indentation (#28321)
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- No base `font-size` is declared on the `<html>`, but `16px` is assumed (the browser default). `font-size: 1rem` is applied on the `<body>` for easy responsive type-scaling via media queries while respecting user preferences and ensuring a more accessible approach.
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- The `<body>` also sets a global `font-family`, `line-height`, and `text-align`. 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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document
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## Native font stack
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The default web fonts (Helvetica Neue, Helvetica, and Arial) have been dropped in Bootstrap 4 and replaced with a "native font stack" for optimum text rendering on every device and OS. Read more about [native font stacks in this *Smashing Magazine* article](https://www.smashingmagazine.com/2015/11/using-system-ui-fonts-practical-guide/).
document
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{% highlight sass %}
$font-family-sans-serif:
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// Safari for macOS and iOS (San Francisco)
document
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-apple-system,
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// Chrome < 56 for macOS (San Francisco)
document
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BlinkMacSystemFont,
// Windows
"Segoe UI",
// Android
reboot.md: Add missing Noto Sans font (#29937) * reboot.md: Add missing Noto Sans font * Sans serif order fix Co-authored-by: Martijn Cuppens <martijn.cuppens@gmail.com>
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Roboto,
document
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// Basic web fallback
reboot.md: Add missing Noto Sans font (#29937) * reboot.md: Add missing Noto Sans font * Sans serif order fix Co-authored-by: Martijn Cuppens <martijn.cuppens@gmail.com>
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"Helvetica Neue", Arial,
// Linux
"Noto Sans",
// Sans serif fallback
sans-serif,
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// Emoji fonts
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"Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji" !default;
document
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{% endhighlight %}
This `font-family` is applied to the `<body>` and automatically inherited globally throughout Bootstrap. To switch the global `font-family`, update `$font-family-base` and recompile Bootstrap.
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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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<table>
<thead>
<tr>
<th>Heading</th>
<th>Example</th>
</tr>
</thead>
<tbody>
<tr>
<td>
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{{ "`<h1></h1>`" | markdownify }}
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</td>
<td><span class="h1">h1. Bootstrap heading</span></td>
</tr>
<tr>
<td>
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{{ "`<h2></h2>`" | markdownify }}
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</td>
<td><span class="h2">h2. Bootstrap heading</span></td>
</tr>
<tr>
<td>
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{{ "`<h3></h3>`" | markdownify }}
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</td>
<td><span class="h3">h3. Bootstrap heading</span></td>
</tr>
<tr>
<td>
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{{ "`<h4></h4>`" | markdownify }}
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</td>
<td><span class="h4">h4. Bootstrap heading</span></td>
</tr>
<tr>
<td>
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{{ "`<h5></h5>`" | markdownify }}
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</td>
<td><span class="h5">h5. Bootstrap heading</span></td>
</tr>
<tr>
<td>
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{{ "`<h6></h6>`" | markdownify }}
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</td>
<td><span class="h6">h6. Bootstrap heading</span></td>
</tr>
</tbody>
</table>
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## 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">
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{% capture markdown %}
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* 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
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{% endcapture %}
{{ markdown | markdownify }}
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</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">
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<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>
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</div>
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## Preformatted text
The `<pre>` element is reset to remove its `margin-top` and use `rem` units for its `margin-bottom`.
<div class="bd-example">
<pre>
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.example-element {
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margin-bottom: 1rem;
}
</pre>
</div>
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## Tables
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Tables are slightly adjusted to style `<caption>`s, collapse borders, and ensure consistent `text-align` throughout. Additional changes for borders, padding, and more come with [the `.table` class]({{ site.baseurl }}/docs/{{ site.docs_version }}/content/tables/).
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<div class="bd-example">
<table>
<caption>
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This is an example table, and this is its caption to describe the contents.
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</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>
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## Forms
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Various form elements have been rebooted for simpler base styles. Here are some of the most notable changes:
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- `<fieldset>`s have no borders, padding, or margin so they can be easily used as wrappers for individual inputs or groups of inputs.
clarify some docs, improve layout
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- `<legend>`s, like fieldsets, have also been restyled to be displayed as a heading of sorts.
More reboot work, commenting out things that have been moved over
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- `<label>`s are set to `display: inline-block` to allow `margin` to be applied.
Fix typos in plural tag names
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- `<input>`s, `<select>`s, `<textarea>`s, and `<button>`s are mostly addressed by Normalize, but Reboot removes their `margin` and sets `line-height: inherit`, too.
Fix three small typos
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- `<textarea>`s are modified to only be resizable vertically as horizontal resizing often "breaks" page layout.
Add note to the summary of important changes
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- `<button>`s and `<input>` button elements have `cursor: pointer` when `:not(:disabled)`.
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These changes, and more, are demonstrated below.
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<form class="bd-example">
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<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>
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<p>
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<label>
<input type="checkbox" value="">
Check this checkbox
</label>
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</p>
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<p>
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<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>
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</p>
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<p>
<label for="textarea">Example textarea</label>
Merge branch 'v4' of https://github.com/twbs/derpstrap into v4 Conflicts: dist/css/bootstrap.css dist/css/bootstrap.css.map docs/assets/css/docs.min.css
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<textarea id="textarea" rows="3"></textarea>
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</p>
<p>
Remove `datetime-local` warning from vnu ignore list, change reboot example.
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<label for="date">Example date</label>
<input type="date" id="date">
</p>
<p>
<label for="time">Example time</label>
<input type="time" id="time">
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</p>
<p>
Merge branch 'v4' of https://github.com/twbs/derpstrap into v4 Conflicts: dist/css/bootstrap.css dist/css/bootstrap.css.map docs/assets/css/docs.min.css
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<label for="output">Example output</label>
<output name="result" id="output">100</output>
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</p>
<p>
<button type="submit">Button submit</button>
<input type="submit" value="Input submit button">
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<input type="reset" value="Input reset button">
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<input type="button" value="Input button">
</p>
<p>
<button type="submit" disabled>Button submit</button>
<input type="submit" value="Input submit button" disabled>
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<input type="reset" value="Input reset button" disabled>
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<input type="button" value="Input button" disabled>
</p>
</fieldset>
</form>
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Add new interaction utilities and role attr to Reboot (#30562) - Adds .user-select-* utils from v5 - Adds button role attribute util, one of the top requested features in our issues for adding pointer cursors - Adds new docs page to demonstrate both - Includes Sass list for customizing user select
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### Pointers on buttons
Reboot includes an enhancement for `role="button"` to change the default cursor to `pointer`. Add this attribute to elements to help indicate elements are interactive. This role isn't necessary for `<button>` elements, which gets it's own `cursor` change.
{% capture example %}
<span role="button">Non-button element button</span>
{% endcapture %}
{% include example.html content=example %}
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## Misc elements
### Address
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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>`.
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<div class="bd-example">
<address>
<strong>Twitter, Inc.</strong><br>
Merge branch 'master' into v4m
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1355 Market St, Suite 900<br>
San Francisco, CA 94103<br>
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<abbr title="Phone">P:</abbr> (123) 456-7890
</address>
<address>
<strong>Full Name</strong><br>
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<a href="mailto:first.last@example.com">first.last@example.com</a>
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</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">
Use .blockquote class in V4 examples page Fix #17888
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<blockquote class="blockquote">
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<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
Fix three small typos
2015-10-19 18:37:19 +02:00
The `<abbr>` element receives basic styling to make it stand out amongst paragraph text.
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<div class="bd-example">
Nulla <abbr title="attribute">attr</abbr> vitae elit libero, a pharetra augue.
</div>
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Set `cursor:pointer` for `<summary>`
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### Summary
The default `cursor` on summary is `text`, so we reset that to `pointer` to convey that the element can be interacted with by clicking on it.
<div class="bd-example">
<details>
<summary>Some details</summary>
<p>More info about the details.</p>
</details>
<details open>
<summary>Even more details</summary>
<p>Here are even more details about the details.</p>
</details>
</div>
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## HTML5 `[hidden]` attribute
Normalize all links. (#24109) * use a trailing slash when possible * use https when possible * remove a few redirected links * consistently use `https://popper.js.org/` * fix `iconUrl` in nuget files * change Jekyll Windows guide to the official one
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HTML5 adds [a new global attribute named `[hidden]`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/hidden), which is styled as `display: none` by default. Borrowing an idea from [PureCSS](https://purecss.io/), we improve upon this default by making `[hidden] { display: none !important; }` to help prevent its `display` from getting accidentally overridden. While `[hidden]` isn't natively supported by IE10, the explicit declaration in our CSS gets around that problem.
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{% highlight html %}
<input type="text" hidden>
{% endhighlight %}
Use callout without custom Jekyll plugin.
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{% capture callout %}
Move from h4s and misc to h5s so headings from example snippets don't show in our table of contents
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##### jQuery incompatibility
Move `[hidden]` style from _utilities.scss to _reboot.scss; fixes #18230 [skip sauce]
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Remove speculations about jQuery 3
2017-08-25 14:01:34 +02:00
`[hidden]` is not compatible with jQuery's `$(...).hide()` and `$(...).show()` methods. Therefore, we don't currently especially endorse `[hidden]` over other techniques for managing the `display` of elements.
Use callout without custom Jekyll plugin.
2018-01-15 23:49:36 +01:00
{% endcapture %}
{% include callout.html content=callout type="warning" %}
Move `[hidden]` style from _utilities.scss to _reboot.scss; fixes #18230 [skip sauce]
2015-11-13 04:15:54 +01:00
Use Jekyll's markdownify filter instead of a custom plugin (#25319)
2018-01-19 18:30:17 +01:00
To merely toggle the visibility of an element, meaning its `display` is not modified and the element can still affect the flow of the document, use [the `.invisible` class]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/visibility/) instead.
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