Differencebetween the Hidden Attribute (Html5) and the Display:None Rule (Css)

What is the difference between the hidden attribute (HTML5) and the display:none rule (CSS)?

The key difference seems to be that hidden elements are always hidden regardless of the presentation:

The hidden attribute must not be used to hide content that could legitimately be shown in another presentation. For example, it is incorrect to use hidden to hide panels in a tabbed dialog, because the tabbed interface is merely a kind of overflow presentation — one could equally well just show all the form controls in one big page with a scrollbar. It is similarly incorrect to use this attribute to hide content just from one presentation — if something is marked hidden, it is hidden from all presentations, including, for instance, screen readers.

http://dev.w3.org/html5/spec/Overview.html#the-hidden-attribute

Since CSS can target different media/presentation types, display: none will be dependent on a given presentation. E.g. some elements might have display: none when viewed in a desktop browser, but not a mobile browser. Or, be hidden visually but still available to a screen-reader.

What is the difference between visibility:hidden and display:none?

display:none means that the tag in question will not appear on the page at all (although you can still interact with it through the dom). There will be no space allocated for it between the other tags.

visibility:hidden means that unlike display:none, the tag is not visible, but space is allocated for it on the page. The tag is rendered, it just isn't seen on the page.

For example:

test | <span style="[style-tag-value]">Appropriate style in this tag</span> | test

Replacing [style-tag-value] with display:none results in:

test |   | test

Replacing [style-tag-value] with visibility:hidden results in:

test |                        | test

What are the differences between these ways to hide sections in an HTML document?

http://www.w3schools.com/css/css_display_visibility.asp

display:none;: the element will be hidden, and the page will be displayed as if the element is not there.

visibility:hidden; also hides an element. However, the element will still take up the same space as before.

As far as I know, hidden does the same as display:none, it's just a HTML5 shortcut. Note that it's not available in IE < 11.

aria-hidden does not hide at all. It acts as a hint for people with disabilities. In supporting browsers in conjunction with supporting assistive technology the content is not conveyed to the user via the assistive technology (screen readers and such).

What's the difference between HTML 'hidden' and 'aria-hidden' attributes?

ARIA (Accessible Rich Internet Applications) defines a way to make Web content and Web applications more accessible to people with disabilities.

The hidden attribute is new in HTML5 and tells browsers not to display the element. The aria-hidden property tells screen-readers if they should ignore the element. Have a look at the w3 docs for more details:

https://www.w3.org/WAI/PF/aria/states_and_properties#aria-hidden

Using these standards can make it easier for disabled people to use the web.

Does hiding of elements by display: none on narrow screens affect accessibility - and if so how to fix it?

According to this MDN page:

Using a display value of none on an element will remove it from the accessibility tree. This will cause the element and all its descendant elements to no longer be announced by screen reading technology.

Hiding an element: Difference between Javascript attribute and CSS style

There's two basic methods for hiding an element with CSS:

Firstly, there's visibility: hidden; (or element.style.visibility = "hidden";). This simply makes the item invisible. It still takes up space in the document, it's still part of the flow.

Then there's display: none; (or element.style.display = "none";). This removes the element from the flow of the document entirely. It's still present in the DOM, it's just not rendered to the page.

HTML5's hidden attribute (or element.setAttribute("hidden", true);) is roughly equivalent to display: none;.

In fact, to give older browsers compatibility with the attribute, this is often added to the stylesheet:

[hidden] { display: none; }


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