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Clarify [hidden] attr docs; closes #17169 

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This commit is contained in:
Chris Rebert 2015-09-23 18:57:21 -07:00
parent 6f025183d5
commit c91e4f5162
2 changed files with 17 additions and 11 deletions
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26
docs/components/utilities.md
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@ -232,16 +232,6 @@ Easily clear `float`s by adding `.clearfix` **to the parent element**. Utilizes
}
{% endhighlight %}
## Hidden content
Hide any HTML element with the `[hidden]` attribute. It's taken from [PureCSS](http://purecss.io). While `[hidden]` isn't natively supported by IE9-10, declaring it `display: none` in our CSS gets around that problem.
Furthermore, `.invisible` can be used to toggle the visibility of an element, meaning its `display` is not modified and the element can still affect the flow of the document.
{% highlight html %}
<input type="text" hidden>
{% endhighlight %}
## Invisible content
The `.invisible` class can be used to toggle only the visibility of an element, meaning its `display` is not modified and the element can still affect the flow of the document.
@ -329,3 +319,19 @@ Aspect ratios can be customized with modifier classes.
<iframe class="embed-responsive-item" src="..."></iframe>
</div>
{% endhighlight %}
## HTML5 `[hidden]` attribute
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](http://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 IE9-10, the explicit declaration in our CSS gets around that problem.
{% highlight html %}
<input type="text" hidden>
{% endhighlight %}
{% callout warning %}
#### jQuery incompatibility
`[hidden]` is not compatible with jQuery's `$(...).hide()` and `$(...).show()` methods. This could potentially change in jQuery 3, but we're not holding our breath. Therefore, we don't currently especially endorse `[hidden]` over other techniques for managing the `display` of elements.
{% endcallout %}
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](#invisible-content) instead.

2
docs/migration.md
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@ -179,7 +179,7 @@ Note that the changes to the grid breakpoints in v4 means that you'll need to go
## Misc notes to prioritize
- Removed the `min--moz-device-pixel-ratio` typo hack for retina media queries
- Dropped `.hidden` and `.show` because they conflict with jQuery's `$(...).hide()` function.
- Dropped `.hidden` and `.show` because they conflict with jQuery's `$(...).hide()` and `$(...).show()` methods.
- Change buttons' `[disabled]` to `:disabled` as IE9+ supports `:disabled`. However `fieldset[disabled]` is still necessary because [native disabled fieldsets are still buggy in IE11](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/fieldset#Browser_compatibility).
TODO: audit list of stuff in v3 that was marked as deprecated