gecko-dev/layout/reftests/native-theme/scroll-thumb-minimum-size-n...

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HTML

<!DOCTYPE html>
<meta http-equiv="msthemecompatible" content="no">
<div style="width: 200px; height: 200px; overflow: scroll;">
<div style="width: 3725px; height: 3725px"></div>
</div>
<!--
The size of the inner div is computed as follow:
Input:
outer_div_size: size of the div containing the scrollbar
button_size: size of the scrollbar arrow buttons
scrollbar_thickness: width/height of a vertical/horizontal scrollbar respectively
thumb_size: height/width of the thumb of a vertical/horizontal scrollbar respectively
Output:
inner_div_size: size of the div to be scrolled
Formula:
slider_size = outer_div_size - 2 * button_size - scrollbar_thickness
thumb_size = slider_size * (outer_div_size / inner_div_size)
which gives:
inner_div_size = (outer_div_size - 2 * button_size - scrollbar_thickness) * (outer_div_size / thumb_size)
Testcase constants:
outer_div_size = 200
On XP/Vista at 96 dpi with theme disabled:
thumb_size = 8 (minimum size)
button_size = 17
scrollbar_thickness = 17
inner_div_size = (200 - 2 * 17 - 17) * (200 / 8) = 3725
-->