Tips revealed: How to use is and where selectors to achieve more flexible CSS layout

Tips: How to use is and where selectors to achieve a more flexible CSS layout

In CSS layout, selectors are a very important part. They allow us to select and style elements based on specific criteria. In the latest CSS specifications, the is and where selectors have become a tool for us to layout web pages more flexibly. This article will reveal how to use these two selectors to achieve a more flexible CSS layout.

First, let’s introduce the is selector. The is selector is called a logical selector, which can select multiple elements at once. For example, we want to select all div and p elements and set their background color to red. The traditional approach is to use multiple selectors separated by commas:

div, p {
  background-color: red;
}

And using the is selector, we can simplify the above code to:

:is(div, p) {
  background-color: red;
}

In this way, we can do it all at once Select multiple elements to make CSS code more concise.

Next, let’s introduce the where selector. The where selector is called a conditional selector, which selects elements based on specific conditions. For example, we want to select all elements with class "container" and whose parent element is div, and set their font color to blue. The traditional approach is to use sub-selectors and class selectors:

div .container {
  color: blue;
}

Using the where selector, we can simplify the above code to:

.container:where(div) {
  color: blue;
}

In this way, we can use specific Conditional selection elements make CSS code more flexible.

In addition to the is and where selectors, we can also use them in combination to achieve more complex layout effects. For example, we want to select all elements whose direct child element is p and whose class is "highlight", and set their font size to 20px. The traditional approach is to implement it through sub-selectors and class selectors:

p > .highlight {
  font-size: 20px;
}

Using is and where selectors, we can simplify the above code to:

p:where(:is(> .highlight)) {
  font-size: 20px;
}

In this way, we can Select elements based on more complex conditions to achieve more flexible CSS layout.

To sum up, the is and where selectors provide us with a more flexible CSS layout method. Through the is selector, we can select multiple elements at once, making the CSS code more concise; through the where selector, we can select elements based on specific conditions, making the CSS code more flexible. Of course, these two selectors can also be used in combination to achieve more complex layout effects. I hope this article can be helpful to you, and I hope you can easily apply the is and where selectors in CSS layout to achieve a more flexible web page layout.

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