Is JSX case-sensitive？
Yes, JSX is case-sensitive. In JSX, HTML tags and React components must be written in proper case. This means that if a tag or component is written in lowercase, it will be treated as a built-in HTML tag, whereas if it is written in uppercase, it will be treated as a user-defined React component.
For example, consider the following JSX code:
jsx
const element =Hello, World!
;
In this code, `` is written in lowercase and is treated as an HTML element. However, if you were to write it as `
`, React would treat it as a user-defined component and would expect a corresponding React component with the name `Div` to be defined.
It is therefore important to remember the case when working with JSX, as using incorrect case can lead to unexpected errors or rendering issues.
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