MediaWiki:Gadget-RainbowHeaders.js
From Elwiki
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$('tr.rainbow').each(function(e){
if(!($(this).css('position') in ['relative', 'absolute'])){
$(this).css('position', 'relative');
}
var trWidth = $(this).width();
$(this).children('th').each(function(e){
var startH = Math.floor($(this).offset().left / trWidth * 360);
var endH = Math.floor(($(this).offset().left + $(this).width()) / trWidth * 360);
startH = Math.max(0, startH);
endH = Math.min(359, endH);
$(this).css('background-image', 'linear-gradient(to right, hsl(' + startH + ', 50%, 50%), hsl(' + endH + ', 50%, 50%))');
});
});
