If your document calls for multiple images each image is fetched separately. SGML is widely used in the publishing industry. Multiple blanks are also ignored in most cases. Browser uses above information to decide how to present document based on the above. Different browsers may interpret the tags in a slightly different manner.
Viewers have control over the size of fonts.
They may want to enlarge fonts to see your document better or for projection in front of audience. Text mode browsers such as Lynx will show only text lines and no graphics but will work on just about any terminal. HTML is not a full scale word processing package. This is a sample sentence to show how the formatting works. Now we will show an image.