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The <HTML> tag notifies the browser that this is an HTML document.

The <TITLE> tag is used to give the document a title. The text of the title appears in the browser's file header bar at the very top of the document, and does NOT appear within the document itself.

The <BODY> tag defines the start of the main part of the document. The "bgcolor" parameter sets the background color of the document. In this case, the colors are specified as 2 byte hexadecimal numbers for each of the Red, Green, and Blue colors: RRGGBB. For example, FF0000 would be pure red, and FFFFFF would be pure white.

"TEACHING PHYSICS USING THE WWW" WORKSHOP, ADV. HTML -- Basic HTML Formatting

Header tags are specified by <H#>, where the # can be from 1 to 5, with 1 producing the largest header and 5 producing the smallest.
The tag is used to produce Italic text.

The <center> tag horizontally centers everything that follows until the </center> tag is reached.

Mission to Mars!

This is the largest header available with the given base font size. Larger text could be produced by changing the default font size of the browser, or by using the tag, where # is some number by which to increase the base font size.

The <HR> tag produces a Horizontal Rule (line). In these statements, the width of the line is specified as a % of the entire page width.

The tag produces a vertical Break. It is effectively like a carriage return. The more tags are used together, the more vertical space is created.

MGS successfully launched at 12:00:50 EST in nearly perfect weather!
The tag produces BOLD text. The tag changes property of the font; here, the color parameter is being set to "red". Certain colors are known by their word descriptions, while others must be specified by the RRGGBB hexadecimal code described above.

(NASA announcement on Thursday, November 7, 1996.)

The tag is a "container" tag which indicates that the preceding text is part of a paragraph and should be treated as a unit. A tag is not necessary [but IS permissible to use] at the end of the paragraph; the next tag defines the end of the previous container and the start of the next. The tag causes some vertical space to be inserted at that location.

MGS stands for Mars Global Surveyor. MGS is a 2300 lb spacecraft that will reach Mars in September of 1997.

causes the browser to display the next item underneath (below) everything displayed up to this point.

Global Surveyor will orbit the planet and take data, but it will not land. It is the first of 10 martian probes to be dispatched during the next decade.