Visibility classes use `!important` to ensure they aren't overridden by more specific selectors. This framework conscientiously avoids using `!important` declarations. This is one of the few components that does.
There are no classes to detect touchscreen devices, as both desktop and mobile browsers inconsistently report touch support. Learn more here: You Can't Detect a Touchscreen
You are on a small screen or larger.
You are on a medium screen or larger.
You are on a large screen or larger.
``` These classes automatically hide the element on screen sizes *below* what's specified in the class. So `.show-for-medium` will hide the element on small, and show it on medium and larger. A separate set of classes allow you to show content *only* on a certain screen size. Just add `-only` to the end of the class.Don't see any text below the code sample? You must be on an *extra* large screen.
You are definitely on a small screen.
You are definitely on a medium screen.
You are definitely on a large screen.
``` --- ## Hide by Screen Size This example shows the opposite: It uses the `.hide` visibility classes to state which elements should disappear based on the device's screen size.There's no .hide-for-small class, because that would just permanently hide the element. For that, you can use the plain old .hide class instead.
If you're reading this, you're on a large screen, and can't see either of the above examples.
Like with `.show`, these classes also have `-only` versions. ```html_example ``` ### Generic Hide Classes And if you really just need something hidden no matter what, there are classes for that as well. The `.hide` and `.invisible` classes respectively set `display: none` and `visibility: hidden` on an element. Note that both of these classes hide content from screen readers. ```htmlCan't touch this.
Can sort of touch this.
``` --- ## Orientation Detection This straightforward example shows how two strings of text determine whether or not an element is visible in different orientations. This will change on mobile devices when you rotate the device. On desktop, the orientation is almost always reported as landscape. ```html_exampleYou are in landscape orientation.
You are in portrait orientation.
``` --- ## Accessibility Adding `display: none` to an element will prevent screen readers from reading it. However, there are techniques to hide content while still making it readable by screen readers. ### Show for Screen Readers Only To visually hide content, while still allowing assistive technology to read it, add the class show-for-sr. ```html_exampleThis text can only be read by a screen reader.
There's a line of text above this one, you just can't see it.
``` ### Hide for Screen Readers Only To hide text from assistive technology, while still keeping it visible, add the attribute `aria-hidden="true"`. This doesn't affect how the element looks, but screen readers will skip over it.It's usually not a good idea to hide content from screen readers. aria-hidden is best used to mask purely visual elements of a page.