What are the reasons that image not being displayed? - Web quality

What are the reasons that image not being displayed?

- The web browser doesn’t display the images due to the low bandwidth provided by the Internet provider.

- There are other reasons also that the images not being displayed and it is as follows:

- The user turned off the displaying of the images from the browser’s settings and then didn’t turn it on.

- The user using the browser that doesn’t support the images so, the display of it can’t be seen.

- The browser doesn’t support the video or images to be displayed and it shows only the text being written.

- Instead of the images the web browser displays the alt attribute that is being written on it.