Thanks for the answers.
I meant that when I copied the source code to try it, I couldn’t see, say, an <img> tag for the header, so I wasn’t sure if that file and other image files are referenced in the html code in some other way, other than img tags.
In normal html, an img tag would specify the file path to the image, regardless of where it’s hosted and regardless of where it’s hosted, it would display with the page. Wasn’t sure how WordPress images are referenced in the html code of the page.
Tony