Talk about why CSS cannot select certain elements

CSS cannot be selected

CSS is a language used to create website designs. It allows us to control the style and layout of web pages. In this process, there are many key functions that allow us to freely master web design, including selecting web elements.

However, sometimes we need to control some elements that cannot be selected. So why can’t CSS select certain elements?

First, we need to understand how CSS works. CSS selectors can select target elements by selecting the relevant properties of the element or by giving a given expression. Basic selectors include tag selectors, class selectors, id selectors, etc. These selectors can help us precisely select certain parts of a web page, such as a title or a button.

However, some elements cannot be selected. Such elements are usually inside the web page and have no specific structure or attributes, so they cannot be selected through CSS selectors. These elements include spaces, carriage returns, tabs and other whitespace characters, whitespace characters between words, comments, etc. These elements are called "unselectable elements".

In CSS, there are some properties that can control these unselectable elements. Includes:

• pointer-events: Can control click events of unselectable elements. Set this attribute to none and the element will not respond to click events.
• user-select: This attribute controls whether the user can select text. If you set this property to none, the user will not be able to select text in the web page, but the browser's built-in copy and paste function will still work.
• Visibility: This attribute can control whether the element is visible. Set this attribute to hidden, then the element will be hidden and cannot respond to any events.

In some special occasions, we may need to use CSS to control these unselectable elements. For example, we need to add a video player control bar to the web page, but we don't want the user to select it. At this time, we can use the above attributes to achieve this purpose.

In summary, CSS cannot select some elements because these elements do not have specific attributes or structures, and they cannot be accurately selected through CSS selectors. However, we can control the behavior and visibility of these elements by leveraging some specific properties.

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