What is display none in css

What are visibility hidden and display none in CSS?

Many candidates are rejected or down-leveled due to poor performance in their System Design Interview. Stand out in System Design Interviews and get hired in 2023 with this popular free course.

When we hide HTML content to the client, there are two main techniques in CSS Cascade Style Sheets that can be used.

1. visibility: hidden — this CSS property makes the text invisible, but the space allocated for it will remain. In other words, the element is hidden from view but not the page flow.
2. display: none — unlike the first property, this means the element will not appear on the page at all. In this case, the tag is removed from the normal flow of the page, which allows other elements to fill it in.

In visibility: hidden , space remains allocated for the text. That is not the case in display: none .

Code

The HTML code

Let’s observe the following example to learn how to use these CSS properties in an HTML page.

The CSS code

#container  
display: flex;
 
justify-content: space-between;
 
width: 71em;
>
 
#left,
#right  
width: 35em;
>
 
#left div:first-child,
#right div:first-child  
background: olivedrab;
>
 
#left div:nth-child(2),
#right div:nth-child(2)  
background: orange;
>
 
#left div:nth-child(3),
#right div:nth-child(3)  
background:cadetblue;
>
 
#left div:last-child,
#right div:last-child  
background:orchid;
>
 
.vh  
visibility: hidden;
>
 
.dn  
display: none;
>

Example 1

Now let’s attach the CSS file to HTML and see what happens to the text inside it.

Explanation

As you can see from the result, we have two blocks: right (control) and left (test). They have the same exact elements, which are four elements and one tag element.

On the left all contents are visible, whereas on the right block we use visibility: hidden and display: none for some tags.

Let’s analyze the result now.

visibility: hidden is used for the first div in the test block (right). As a result, the content is hidden but the space for it is still available. This is because visibility: hidden hides the element but still leaves it on the page flow.

Next, we apply display: none to . What you see is that the content disappears completely, and its space is used by other elements (i.e., in this example).

As we said above, display: none hides an element and removes it from the normal flow of the page.

You can also remark that in we used visibility: hidden for the span element.

Example 2

In this example, we’ll see how the properties behave with child nodes. We will use inline CSS styling here.

 
This is the parent area
 
I am the child
 
 
 

In the code snippet above, the parent area is hidden, but the child area is visible if we use display: none in the same context as this:

 
This is the parent area
 
I am the child
 
 
 

Nothing is shown to the user, though we asked to display the child div (using display: block ). This is because display: none , when applied to the parent div , removes everything in the page flow.

Источник

CSS Layout — The display Property

The display property is the most important CSS property for controlling layout.

The display Property

The display property specifies if/how an element is displayed.

Every HTML element has a default display value depending on what type of element it is. The default display value for most elements is block or inline .

This panel contains a element, which is hidden by default ( display: none ).

It is styled with CSS, and we use JavaScript to show it (change it to ( display: block ).

Block-level Elements

A block-level element always starts on a new line and takes up the full width available (stretches out to the left and right as far as it can).

Examples of block-level elements:

Inline Elements

An inline element does not start on a new line and only takes up as much width as necessary.

This is an inline element inside a paragraph.

Examples of inline elements:

Display: none;

display: none; is commonly used with JavaScript to hide and show elements without deleting and recreating them. Take a look at our last example on this page if you want to know how this can be achieved.

The element uses display: none; as default.

Override The Default Display Value

As mentioned, every element has a default display value. However, you can override this.

Changing an inline element to a block element, or vice versa, can be useful for making the page look a specific way, and still follow the web standards.

Example

Note: Setting the display property of an element only changes how the element is displayed, NOT what kind of element it is. So, an inline element with display: block; is not allowed to have other block elements inside it.

The following example displays elements as block elements:

Example

The following example displays elements as block elements:

Источник

CSS display:none and visibility:hidden – What’s the Difference?

Dillion Megida

display:none and visibility:hidden are two style declarations you can use to hide elements on the screen with CSS. But what are the differences between them?

When building applications, there are times that you want to hide elements visually (not deleting them from the DOM, just the screen). You can do this in different ways.

Two common approaches include using the display property with a none value or the visibility property with a hidden value.

Although both approaches hide the element visually, they cause the element to behave in different ways. I’ll explain these differences in this article.

Here is the video version of this article if you’re interested.

Here’s the example I’ll use to explain how this all works:

.container < padding: 20px; width: max-content; display: flex; border: 1px solid black; >.block1, .block2, .block3 < height: 40px; width: 120px; >.block1 < background-color: rgb(224, 110, 49); margin-right: 20px; >.block2 < background-color: rgb(77, 77, 234); margin-right: 20px; >.block3

We have a div with a class of container. This div has three children div s with classes of block1, block2 and block3, respectively. We’ve specified some styles for the divs . The first div child is orange, the second is blue , and the third is teal .

How to Use display: none in CSS

The display property sets how an element is displayed (as inline or block) and also determines the layout of the children of an element (as flex, grid, and so on).

With a none value for this property, the display for the element is turned off. This means the element – as well as its children – will not be displayed. The document is rendered without the element like it did not exist.

Now let’s see how display: none works. Here is an example with this style applied to the .block2 element:

As you can see here, the .container element has reduced in width. It’s just like the .block2 element does not exist. Because we used display:none on this element, it is not rendered in the document. So its space on the screen becomes vacant for other elements to occupy.

We can also test this by moving adding display:none to the .block1 element:

Here you see that .block1 and .block2 are not rendered, so their spaces are occupied.

How to Use visibility: hidden in CSS

The visibility property, as the name implies, specifies whether an element is visible or not. But, this property does not affect the element’s layout. This is the major difference when compared to the layout property.

With a hidden value for this property, the element it is applied to becomes «invisible». The space required by the element’s box model stays but the element itself is hidden.

Let’s see how this property applies to our example above. Here is the result of this style applied to the .block2 element:

As you’ll notice here, unlike display: none , the .block2 element is invisible, but its layout stays intact. In fact, the margin-right on this element is still there. Only the element itself is hidden.

Let’s also add this style to .block1 to see the result:

Now both elements are invisible, but they are still rendered in the document so their space is not vacant.

The next thing you may be thinking is that «what is the difference between visibility: hidden and opacity: 0 ?»

visibility: hidden vs opacity: 0

Both styles look very similar. I can show you this by replacing visibility:hidden with opacity:0 in our above examples:

You can see that there’s no difference visually between this result and the previous one. But there is a difference in the behavior of the elements.

Elements with visibility: hidden are non-interactable. I don’t know if this is the best word for this 😂 but what I mean is that users cannot interact (for example, by clicking) with such elements. That’s because such elements are indeed invisible.

Elements with opacity: 0 on the other hand are interactable as they are actually visible, just very transparent. The opacity property doesn’t specify the visibility of an element – it only specifies transparency.

We can verify this difference with an example. Let’s say the .block2 element had an onclick attribute like this:

If you use visibility:hidden on this element, clicking on the space where the element is will trigger nothing. But if you use opacity:0 on this element, clicking on that same space will trigger the alert modal showing the «hello» text. You can test this on your browser to see this live.

Use Cases for display:none and visibility:hidden

These style declarations can serve different purposes depending on what you want to achieve.

In my experience, I use display:none when I want to hide anything. Think of hiding a popup, a todo list item on the UI that has been checked, or the sidebar in a page.

Using visibility:hidden for these things causes their space to be retained, and it could make a page look odd when there’s a blank space.

The only times I use visibility:hidden is when I want to display some animation while I «hide» or «show» an element. The display property does not animate between values but the visibility property can. I use visibility in combination with opacity for such fade in and fade out animations.

Wrap up

In summary, display:none , visibility:hidden , and opacity:0 can be used to hide elements visually but:

• display:none turns off the layout of the elements, so they are not rendered
• visibility:hidden hides the elements without changing their layouts
• opacity:0 causes the elements to be very transparent but users can still interact with them.

If you enjoyed this article, please share it with others to learn 😇

Источник