Absolute Measurement : Absolute sizes define the size of the font according to the sizes defined in the user-agent. Absolute font sizes include: xx-small, x-small, small, medium (the default), large, x-large, and xx-large.
Relative Measurement: sizes define the size of the font relative to the parent element. Relative fonts are either the same size as the parent, larger, or smaller.
Points/Picas: A unit of measurement used to measure typefaces. It equals 12 points, which is approximately 1/6 of an inch. Point A unit of measurement used to measure typefaces. It equals one twelfth of a pica, which is .3515 mm, or .01383 of an inch. There are 72 points per inch.
x-height:The distance between the baseline of a line of type and tops of the main body of lower case letters (i.e. excluding ascenders or descenders). The x-height is a factor in typeface identification and readability.
The em. The en: A distance equal to the type size - 12 points in a 12 point typeface, 11 points in an 11 point typeface and so on. An em. is half an em.
Dashes (hyphen, en, em): a dash the width of the letter "m" used in text to separate a parenthetical note as an alternate to parenthesis.
Alignments: Justification, Flush Left, Flush Right
Letterspacing: setting either by kerning or tracking.
Kerning: The term kerning refers to adjusting the space between two letters.
Tracking: Adjusting the letterspacing and wordspacing of a range of characters by the same amount. This is in addition to any kerning adjustments made.
Word Spacing: The adjustment of space between words.
Widow: The final line of a paragraph that is left over onto the top of the next column.
Orphan : A single word that is left over on the last line at end of paragraph. Alternatively, a single word or line from the beginning of a paragraph left at the bottom of a column or page, with the remainder on the next column or page.
Leading : The vertical distance, negative or positive, of the baseline of one line to the baseline of the next from a solid setting.
Indent: Text is indented from the left margin.
Fist Line Indent: The text is indented from the left or right margin, it affects several lines of texts, often used for quotes.
Hanging Indent: The first line is not indented, and hangs off to the left
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