The commands are called tags, and they have attributes within them to sort of "customize" the tags.
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File extensions.
A .jpeg file is not in an HTML file. It is a separate file that is called from the HTML file to display on the browser. You can get the URL of the jpeg file from the HTML file and if the graphic is still there, the file can be obtained from its location. If you are on the actual web page that displays the image, you can usually right click on the image and select 'Save As' and save the file. Some web sites have their images protected to prevent you from saving their photos onto your harddrive.
Where is the HTML file on you blog?
A block of information stored in an HTML file on a server is called a control file. A file may contain program instructions or data, which may be numerical, textual or graphical information.
The original extension of a HTML page was .htm because of file name restrictions that limited filetype extensions to 3 characters, today you can use 3 or 4 so either .html or .htm is perfectly fine.