Let's talk about hidden properties in CSS

CSS is an essential part of website design, and the hidden properties in it can help us hide specific elements when needed. This article will introduce how to use hidden properties in CSS and how to use this property in actual projects to achieve a better user experience.

1. Hidden properties in CSS

In CSS, there are three common hidden properties: display, visibility and opacity.

1. display attribute

The display attribute is used to control the display mode of elements, including the following values:

• block: display the element For block-level elements, line breaks will be added before and after.
• none: The element will not be displayed and will not occupy space on the page.
• inline: Display the element as an inline element without adding newlines before and after.
• inline-block: Display the element as an inline block element.
• flex: Display elements as flexible containers.
• grid: Display elements as grid containers.

2. visibility attribute

The visibility attribute is used to control the visibility of elements, including the following values:

• visible: The element is visible.
• hidden: The element is invisible, but still takes up space on the page.
• collapse: The element is collapsed, used for table rows and columns.

3. opacity attribute

The opacity attribute is used to control the transparency of the element, with a value ranging from 0 (completely transparent) to 1 (completely opaque).

2. To hide elements

1. Use display:none

When you need to hide an element, you can use display:none to hide it. For example:

#hide-me {
  display: none;
}

At this time, the element with the id hide-me will not be displayed and will not occupy the space on the page.

2. Use visibility:hidden

If you need to retain the position and size of an element on the page, but don't want it to be visible, you can use visibility:hidden. For example:

#invisible {
  visibility: hidden;
}

At this time, the element with the id of invisible will not be displayed, but it will still occupy the space on the page.

3. Use opacity:0

If you need to make an element completely transparent but still want to take up space on the page, you can use opacity:0. For example:

#transparent {
  opacity: 0;
}

At this time, the element with the id of transparent will be completely transparent, but it will still occupy the space of the page.

3. Hiding in practical applications

Using the hidden attributes in CSS can achieve a better user experience in actual projects. Here are a few examples.

1. Suspended Menu

In some websites, floating menus are often used for navigation or other functions. When the user hovers the mouse over a certain area, the menu will be displayed at that location. If there is no need for a floating menu, it needs to be hidden. For example:

#menu {
  display: none;
}

#hover-area:hover #menu {
  display: block;
}

When the mouse hovers over the area with the ID hover-area, the element with the ID menu will be displayed.

2. Modal box

In web pages, modal boxes are often used to display some prompt information, pop-up advertisements, etc. When the modal box is not needed, it needs to be hidden. For example:

#modal {
  display: none;
}

.button {
  cursor: pointer;
}

#myModal:target {
  display: block;
}

In the above code, when the button is clicked, the jump target will be set to the page area with the id myModal through the anchor point, thereby displaying the modal box.

3. Responsive Design

With the continuous development of mobile devices, responsive design has become an important concept in modern website development. In responsive design, it is often necessary to use display:none to hide certain elements so that the website displays more reasonably on mobile devices. For example:

@media only screen and (max-width: 480px) {
  #sidebar {
    display: none;
  }
}

In the above code, when the screen width is less than or equal to 480 pixels, the element with id sidebar will be hidden to adapt to the display of mobile devices.

Summary

This article introduces hidden properties in CSS and their practical applications. In actual projects, hidden attributes are often used to implement functions such as floating menus, modal boxes, and responsive design, which can help us achieve a better user experience. At the same time, care needs to be taken not to abuse when using hidden attributes to keep the website accessible and usable.

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