See Wikipedia:Typography for a typeface comparison
Screenshots of this page in different browsers can be found at User:Edokter/fonttest/screenshots

Size comparison

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Using HTML

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<small> - The Quick Brown Fox Jumps Over The Lazy Dog
(normal) - The Quick Brown Fox Jumps Over The Lazy Dog
<big> - The Quick Brown Fox Jumps Over The Lazy Dog

Using CSS keywords

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smaller - The Quick Brown Fox Jumps Over The Lazy Dog
(normal) - The Quick Brown Fox Jumps Over The Lazy Dog
larger - The Quick Brown Fox Jumps Over The Lazy Dog

xx-small - The Quick Brown Fox Jumps Over The Lazy Dog
x-small - The Quick Brown Fox Jumps Over The Lazy Dog
small - The Quick Brown Fox Jumps Over The Lazy Dog
medium - The Quick Brown Fox Jumps Over The Lazy Dog
large - The Quick Brown Fox Jumps Over The Lazy Dog
x-large - The Quick Brown Fox Jumps Over The Lazy Dog
xx-large - The Quick Brown Fox Jumps Over The Lazy Dog

Using CSS pt

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sans-serif

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6 - The Quick Brown Fox Jumps Over The Lazy Dog
7 - The Quick Brown Fox Jumps Over The Lazy Dog
8 - The Quick Brown Fox Jumps Over The Lazy Dog
9 - The Quick Brown Fox Jumps Over The Lazy Dog
10 - The Quick Brown Fox Jumps Over The Lazy Dog
11 - The Quick Brown Fox Jumps Over The Lazy Dog
12 - The Quick Brown Fox Jumps Over The Lazy Dog
13 - The Quick Brown Fox Jumps Over The Lazy Dog
14 - The Quick Brown Fox Jumps Over The Lazy Dog
15 - The Quick Brown Fox Jumps Over The Lazy Dog

serif

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6 - The Quick Brown Fox Jumps Over The Lazy Dog
7 - The Quick Brown Fox Jumps Over The Lazy Dog
8 - The Quick Brown Fox Jumps Over The Lazy Dog
9 - The Quick Brown Fox Jumps Over The Lazy Dog
10 - The Quick Brown Fox Jumps Over The Lazy Dog
11 - The Quick Brown Fox Jumps Over The Lazy Dog
12 - The Quick Brown Fox Jumps Over The Lazy Dog
13 - The Quick Brown Fox Jumps Over The Lazy Dog
14 - The Quick Brown Fox Jumps Over The Lazy Dog
15 - The Quick Brown Fox Jumps Over The Lazy Dog

Using CSS px

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Image demonstrating how several font sizes in px are rendered on a screen set at 96dpi (default 'normal' font size setting on Windows) and default browser settings

sans-serif

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8 - The Quick Brown Fox Jumps Over The Lazy Dog
9 - The Quick Brown Fox Jumps Over The Lazy Dog
10 - The Quick Brown Fox Jumps Over The Lazy Dog
11 - The Quick Brown Fox Jumps Over The Lazy Dog
12 - The Quick Brown Fox Jumps Over The Lazy Dog
13 - The Quick Brown Fox Jumps Over The Lazy Dog
14 - The Quick Brown Fox Jumps Over The Lazy Dog
15 - The Quick Brown Fox Jumps Over The Lazy Dog
16 - The Quick Brown Fox Jumps Over The Lazy Dog
17 - The Quick Brown Fox Jumps Over The Lazy Dog

serif

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8 - The Quick Brown Fox Jumps Over The Lazy Dog
9 - The Quick Brown Fox Jumps Over The Lazy Dog
10 - The Quick Brown Fox Jumps Over The Lazy Dog
11 - The Quick Brown Fox Jumps Over The Lazy Dog
12 - The Quick Brown Fox Jumps Over The Lazy Dog
13 - The Quick Brown Fox Jumps Over The Lazy Dog
14 - The Quick Brown Fox Jumps Over The Lazy Dog
15 - The Quick Brown Fox Jumps Over The Lazy Dog
16 - The Quick Brown Fox Jumps Over The Lazy Dog
17 - The Quick Brown Fox Jumps Over The Lazy Dog

Using CSS percentages

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sans-serif

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80 - The Quick Brown Fox Jumps Over The Lazy Dog
81 - The Quick Brown Fox Jumps Over The Lazy Dog
82 - The Quick Brown Fox Jumps Over The Lazy Dog
83 - The Quick Brown Fox Jumps Over The Lazy Dog
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100 - The Quick Brown Fox Jumps Over The Lazy Dog
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serif

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80 - The Quick Brown Fox Jumps Over The Lazy Dog
81 - The Quick Brown Fox Jumps Over The Lazy Dog
82 - The Quick Brown Fox Jumps Over The Lazy Dog
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monospace

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80 - The Quick Brown Fox Jumps Over The Lazy Dog
81 - The Quick Brown Fox Jumps Over The Lazy Dog
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