Visibility:Hidden VS Display:None VS Opacity:0

visibility:hidden vs display:none vs opacity:0

The answer found here will answer your first question (most likely display:none as the space is collapsed completely).

To your second question, tools such as this will probably be useful for you. However 40,000 divs sounds like way too many and you will probably have better performance using canvas or SVG (for example, using the KineticJS library as this handles animations - transformation, rotation, scale, etc.) for you.

Does opacity:0 have exactly the same effect as visibility:hidden

Here is a compilation of verified information from the various answers.

Each of these CSS properties is unique. In addition to rendering an element not visible, they have the following additional effect(s):

1. Collapses the space that the element would normally occupy
2. Responds to events (e.g., click, keypress)
3. Participates in the taborder

                     collapse events taborder
opacity: 0              No     Yes     Yes
visibility: hidden      No     No      No
visibility: collapse   Yes*    No      No
display: none          Yes     No      No

* Yes inside a table element, otherwise No.

Within CSS what is the difference between opacity:0 and display:none?

display: none lets the element disappear. Just like it isn't present. This means your layout may change.

opacity: 0 this one just makes your element invisible. It doesn't take any effect on your layout.

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 is different between Opacity, Visibility and Display in css?

Display:

• Can't be read by screenreaders. If you put display: none on your body tag, your page will never popup in the Google result, because Google sees it as a blank page.
• height = 0
• width = 0
• animatable: no

Visibility:

• Can be read by screenreaders. If you put visibility: hidden on your body tag, your page will popup in the Google result, but a visitor will just see a blank page
• height = initial;
• width = initial;
• animatable: no

Opacity:

• Can be read by screenreaders. If you put opacity: 0 on your body tag, your page popup will in the Google result, but a visitor will just see a blank page;
• height = initial;
• width = initial;
• animatable: yes

Performance differences between visibility:hidden and display:none

I'm not aware of any performance difference between display:none and visibility:hidden - even if there is, for as little as 10 elements it will be completely negligible. Your main concern should be, as you say, whether you want the elements to remain within the document flow, in which case visibility is a better option as it maintains the box model of the element.

What is the difference between visibility: hidden and transform: scale(0,0)?

If you set the visibility of an element to hidden it is hidden but still takes up space.

If you set the visiblity to collapse it will not take up space and will behave the same as display:none. But collapse can only be used on table elements.

transform: scale(0,0) will just set the size to 0,0 meaning css properties like float or clear will still take affect on other elements.

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