Go Through the Problem HTML REALLY Slowly, sometimes it’s just as simple as a
Extra elements will only make troubleshooting harder. Removing extra elements can be key to solving your problem. In your source code, comment out the link to your stylesheet or other elements you want to eliminate temporarily but not delete.
The notorious red “x” that shows in place of an image is also a common error. Check that the path and file name of the image is correct, including the file extension (.jpg, .gif, etc.). You should also check that the image has been uploaded to your Web server in the correct folder specified in the path.
Image in same folder as html
Image in different folder then html (for example images folder)
Image from an external website