I'm sure this is probably quite incomplete, but it still may be useful.

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A
absolute ( url ) an entire internet address; it includes the complete path and filename. exp: https://members.tripod.com/~Zannadu/title.html
alignment the positioning of an object, usually left, right, center, middle, top, or bottom. Attribute: ALIGN="..."
anchor link; clickable text or image which directs the browser to a new address or mailto. exp: [A]text/image[/A] HOME
attribute additional info in a tag, usually specifying the color(s), alignment, sizes, etc. of the tag's object. exp: [BODY BGCOLOR="#000000"]

B
background ( bg ) the color or image used as a setting or backdrop for a page. beginner ( tag ) first of a set of paired tags; contains attributes and marks the beginning of the code. aka opener tag
bold text attribute. [B][/B] appears like this.

C
case-sensitive urls Must be exact when it comes to capital or lowercase letters or else they will not work; they are called case-sensitive. Commands that work despite capitalization are known as case-insensitive
cgi-bin directory directory on a server where programs are usually stored and sorted. Can be reached through passwords, and are usually used by website hosts.
clickable links or buttons, click to activate
closer or closing tag the second of a pair of tags; indicates the end of the command. It appears as the same as the beginner tag, minus the attributes, and with a slash. exp: [BODY BGCOLOR="] = beginner tag [/BODY]
counter mini server program; after posting it on a page, it tallies the amount of visits the page has received

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D
download abb. d/l; to transfer a file to your harddrive or to a disk from an outside source.

E
external link links away from the current HTML document to elsewhere in the site, or to another point on the web.

F
filename the basic name of the file, usually has an extension after it, known as a filetype.
filetype a file extension, such as ".html" or ".gif"
file transfer protocol ( FTP ) internet transfer program, used to u/l or d/l files directly. you can use this to transfer images, etc to your webhost or site.
font the appearance or face of text. [FONT FACE="..."][/FONT]
form a provided html document; readers are allowed to fill it out with info and send it; usually responses to surveys or quizzes.
frame a division of the browser window, each contains a separate html document.
frameset document html document which sets up the configuration of frames. to view the frames, link to the frameset document.

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G
GIF image file; most common image filetype for htmls because all browsers can read them. may take up more membory than other filetypes, however

H
[HEAD] optional, sets apart information on the title, etc. headline creates large, bolded text. [H1][/H1] being the largest, [H6][/H6] being the smallest; used in pairs
homepage the main menu or introduction page of a site.
horizontal rule a horizontal line across a document, for a plain one, use the [HR] tag.
hyperspace that grey area seen while linking from site to site... a totally made up "place."

I
image graphic or picture
imagemap a clickable image or part of an image.
internal link link to a different area in the same document...like my little letter thingies here.

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J
JPG or JPEG image filetype that works best when using photographs. they can be viewed by most webbrowsers and are another common image type used in html.

K

L
link direct clickable connection to another site, html document or section of html document.

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M

N
nesting process of putting tags within another set of tags.

O
opening ( tag ) see beginner tag.

P
paired tags tags always appearing in pairs, with one beginner and one closer.
paragraph section of text ( may also include images, ) set apart by a double space. [P][/P]
pixel individual "dots" making up an image or area on the screen.

Q

R
radio button one of a group of small round buttons; only one in each set may be selected at once. relative ( url ) links to another document in the same directory, so it doesn't need any part of the address before the document name itself.

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S
server HTML server, or web server; provides storage for files displayed on the web, or for other computers.
site a collection of pages on the web.
structure tag tells browsers info about the document, but is not affect the visible document. exp: [HTML] let's browsers know that the document is indeed an html doc.

T
tag command in markup language, in html it's enclosed in greater than and less than signs.
target part of the directions in a link. targets specifiy where the linked page will load, or which part of a page is linked to.
thumbnail small version of an image which takes little time to load, usually used as a preview linking to the actual image.
[TITLE][/TITLE] specifies what will be shown in the window title.

U
URL ( Universal Resource Locator ) an internet address.

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V

W

X

Y

Z

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