html - Why does this look different on FF vs. Chrome vs. IE? -

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i'm trying make graphs on number line (think math class) html , css.

here's i've got: http://jsfiddle.net/3pkrj/2/

1.) looks on ff.
2.) on chrome it's good, arrowheads @ beginning , end of line 1 px high. there tiny dots in middle of red line. 3.) of course, ie fails miserably.
4.) don't know safari b/c don't have it.

it seems top: ___px; part being interpreted differently different browsers. ideas on how make browsers display ff does?


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