YUI Fonts CSS normalizes the font size and line height across all browsers. The default rendering, with YUI Fonts in place, is Arial font at 13px size and 16px line height.

Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit Lorem ipsum dolor sit amet, volutpat.

This is 2nd level heading bh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi luptatum zzril delenit Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam no

Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut in adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

This is 3rd level heading

This is 4th level heading

This is 5th level heading

This is 6th level heading

Basic block level elements

Lorem ipsum dolor sit amet, elit, sed diam nonummy nibh euismod tincidunt ut consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

This holds an address. Block level, but without margin or padding because they're often stacked.

This is a div element. Lorem ipsum dolor sit amet, elit, sed diam nonummy nibh euismod tincidunt ut consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. (End of div.)

This is a block quotation containing a single paragraph. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

The following contains address information about the author, in an address element.

Lists

This is a paragraph before an unnumbered list (ul). Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

One.
Two.
Three. Well, probably this list item should be longer. Note that for short items lists look better if they are compactly presented, whereas for long items, it would be better to have more vertical spacing between items.
Four. This is the last item in this list. Let us terminate the list now without making any more fuss about it.

This is a paragraph before a numbered list (ol). Note that the spacing between a paragraph and a list before or after that is hard to tune in a user style sheet. You can't guess which paragraphs are logically related to a list, e.g. as a "list header".

One.
Two.
Three. Well, probably this list item should be longer. Note that if items are short, lists look better if they are compactly presented, whereas for long items, it would be better to have more vertical spacing between items.
Four. This is the last item in this list. Let us terminate the list now without making any more fuss about it.
Five
Six
Seven
Eight
Nine
Ten

This is a paragraph before a definition list (dl). In principle, such a list should consist of terms and associated definitions. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

Apple: is a fruit.
Banana: Is also a fruit.
Tomato: Is debatable. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

Text-level markup

CSS (an abbreviation; abbr markup used)
radar (an acronym; acronym markup used)
Origin of Species (a book title; cite markup used)
a[i] = b[i] + c[i); (computer code; code markup used)
an octet is an entity consisting of eight bits (dfn markup used for the term being defined)
this is very simple (em markup used for emphasizing a word)
type yes when prompted for an answer (kbd markup used for text indicating keyboard input)
Hello! (q markup used for quotation)
He said: She said Hello! (a quotation inside a quotation)
you may get the message Core dumped at times (samp markup used for sample output)
this is highlighted text (strong markup used)
text in monospace font (tt markup used)
the command cat filename displays the file specified by the filename (var markup used to indicate a word as a variable).
In order to test how subscripts and superscripts (sub and sup markup) work inside running text, we need some dummy text around constructs like x₁ and H₂O (where subscripts occur). So here is some fill so that you will (hopefully) see whether and how badly the subscripts and superscripts mess up vertical spacing between lines. Now superscripts: M^lle, 1^st, and then some mathematical notations: e^x, sin² x, and some nested superscripts (exponents) too: Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

Some of the elements tested above are typically displayed in a monospace font, often using the same presentation for all of them. This tests whether that is the case on your browser:

This is sample text inside code markup
This is sample text inside kbd markup
This is sample text inside samp markup
This is sample text inside tt markup

Tables

The following table has a caption. The first row and the first column contain table header cells only; other cells are data cells.

Caption: Sample table: Areas of the Nordic countries, in sq km
Country	Total area	Land area
Denmark	43,070	42,370
Finland	337,030	305,470
Iceland	103,000	100,250
Norway	324,220	307,860
Sweden	449,964	410,928

Forms

This next bit shows that PREformatted text is working.