Markdown playground

Text-centering test

Note that GitHub Wiki doesn't seem to observe any text-alignment instructions:

This paragraph uses <center> tags.

This paragraph uses style="text-align:center" in the paragraph tag.

This paragraph uses style="text-align:right" in the paragraph tag.

Base 64 images test

(Doesn't work on github)

1) 2)

1) the referenced base64 block stops being parsed right at the point where 'a new chunk of image' starts, the green part ... So4Z4wxkXa7KukmKul2dDvd ...
2) by passing the block directly we get the whole image

This was tested with http://tmpvar.com/markdown.html. I don't know how it behaves on github. The issue has been already well discussed.

Displaying literal HTML

Code block or <em>inline</em>. Or use an HTML character entity (<) for the leading angle bracket: <tag>. Here's the code block:

<p>
This is HTML.
</p>

Subscript and superscript

Here's some ^{superscript text}. And here is some _{subscript text}. Note that ^superscript^ doesn't work, and using the tilde to demarcate subscripts is strikout markup.

How does a table work?

Section

The point of a table is that it is rigid. Information is easily interpreted by making visual associations between row and column headers. Look at the table below for example and find a Jovian gas giant with 62 moons. You can find the answer by associating the relevant row and column headers.

		Name	Mass (1024kg)	Diameter (km)	Density (kg/m3)	Gravity (m/s2)	Length of day (hours)	Distance from Sun (106km)	Mean temperature (°C)	Number of moons	Notes
Terrestial planets		Mercury	0.330	4,879	5427	3.7	4222.6	57.9	167	0	Closest to the Sun
		Venus	4.87	12,104	5243	8.9	2802.0	108.2	464	0
		Earth	5.97	12,756	5514	9.8	24.0	149.6	15	1	Our world
		Mars	0.642	6,792	3933	3.7	24.7	227.9	-65	2	The red planet
Jovian planets	Gas giants	Jupiter	1898	142,984	1326	23.1	9.9	778.6	-110	67	The largest planet
		Saturn	568	120,536	687	9.0	10.7	1433.5	-140	62
	Ice giants	Uranus	86.8	51,118	1271	8.7	17.2	2872.5	-195	27
		Neptune	102	49,528	1638	11.0	16.1	4495.1	-200	14
Dwarf planets		Pluto	0.0146	2,370	2095	0.7	153.3	5906.4	-225	5	Declassified as a planet in 2006, but this remains controversial.

When done correctly, even blind people can interpret tabular data in an HTML table — a successful HTML table should enhance the experience of sighted and visually impaired users alike.