Why is the background image not functioning in HTML and CSS?

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There could be several reasons why the background image is not functioning in HTML and CSS:

1. Wrong image file path: Ensure that the image file path specified in the CSS code is correct and leads to the location of the image file.

2. Incorrect syntax: Check if the CSS syntax used for defining the background image is correct. The syntax should be "background-image: url('path-to-image-file')".

3. Image file format: The image file should be in a compatible format like JPEG, PNG, or GIF for it to be displayed as background.

4. Image file size: The image file size should not be too large, as it can slow down the web page's loading time.

5. CSS specificity: Check that no other CSS rules override the background image rule defined for the selected element.

6. HTML structure: Ensure that the HTML structure is correct, and the element with the background image rule is placed in the correct location in the HTML code.

7. Browser compatibility: Some web browsers may not support certain CSS properties, which may result in the background image not displaying properly. Ensure that the CSS is compatible with various web browsers.