Let's talk about several ways to control hiding in CSS

CSS control hiding is one of the most commonly used techniques in web development. Through CSS code, developers can hide certain elements on the web page to achieve the beauty and functionality of the web page. This article will briefly introduce several ways to control hiding in CSS and provide examples.

1. Related CSS syntax

1. display:none;
   This attribute completely hides the element and does not occupy page space. Hidden elements will not be visible to the user, nor will they be able to receive user events. When using this attribute, please note that the child elements of the hidden element will be hidden together.
2. visibility:hidden;
   This attribute hides the element, but it takes up space in the document flow, making the hidden element invisible but taking up space on the page. Hidden elements can still receive user events.

2. Common usage scenarios and examples

1. Hide certain elements in the webpage
   For example, hide a certain button, text, picture, etc. Here is an example that demonstrates how to hide a button:

button {
  display: none;
}

2. Adjust element position
   By hiding certain elements, you can adjust the page layout and achieve better visual effects. For example, the following code demonstrates how to hide the footer of the current page:

.footer {
  visibility: hidden;
}

3. Implementation of hover effect
   If you need to trigger some operations when the mouse hovers over an element, you can This is achieved by hiding and showing elements. Here is an example that demonstrates how to display an additional text tip when the mouse hovers over the button:

.btn-tooltip span {
    display: none;
}
.btn-tooltip:hover span {
    display: block;
}

4. Mobile Optimization
   When you need to develop web pages on the mobile side , it is often necessary to adjust the page layout according to the size and orientation of the screen. In this case, developers can use CSS control hiding to dynamically hide or show certain elements to fit the screen size. For example:

@media screen and (max-width: 768px) {
    .sidebar {
        display:none;;
    }
}

3. Notes

1. Since display:none completely hides the element and cannot receive user events (such as clicks, hovers, etc.), developers Special care needs to be taken to avoid using this property in key interaction areas.
2. When the browser parses the style sheet, it will first read the display:none element, and subsequent elements will cover the previous elements. This is a very important property, and it can also develop many new functions.
3. When visibility:hidden is used to hide elements, the hidden elements still occupy layout space. Therefore, when using the visibility attribute to control hiding, layout needs to be considered.
4. If the child elements of a hidden element need to be displayed, they need to be implemented through CSS code.

In short, CSS control hiding has a wide range of application scenarios. Mastering this technology can help developers better realize the design and functional requirements in web development and improve the user experience of the website.

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