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This article focuses on "are HTML class selectors and ID selectors case sensitive?". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "are HTML class selectors and ID selectors case sensitive?"

Note that class selectors and ID selectors may be case-sensitive. It depends on the language of the document. HTML and XHTML define the class and ID values as case-sensitive, so the case of the class and ID values must match the corresponding values in the document.

Therefore, for the following CSS and HTML, the element does not become bold:

# intro {font-weight:bold;} This is a paragraph of introduction.

Because the case of the letter I is different, the selector does not match the above elements.

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