The object of this competition is to create a cool JavaScript "application" no larger than 1k. Starting out as a joke, the first version ended with a serious amount of submissions, prizes and quality.

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I have a Crush on JS

By: Aivo Paas
Twitter: @aivopaas
Website: http://www.iteral.com/jscrush/

Bytes: 1024
Chars: 1022
Demo: click here

Submission

_="b=\"Java ❤ source i^#b>CRUSH</#> <bs></b> o\"+b;Q=[]6q127;--iz-1013343992Q.push(Strg.fromCharCode(i))@setTimeout(\"i=e( sByTagName('[1]D/5n)De(_)/,'_@L()\"@b.onclick=A=encodeURIPD%..i};FiDn/5n)|[rn]+[t ]*D,b=s/2,mG'6S;m=c+m){c=0,q122;!c--i;)!~ Q(c=Q;!co={},M=N=e=Z=06t=2;t<=b;tVn=s-t,q0z<nzV!W=s.substr(Ki,t)]~())Z=t,W]=1;~j;W]V;b=Z6i  o){K(R=o*(KL(i)|A)-R-j;j>1)j>M||K=MR>N)M=j,N=R,e=i}!eFse)`c)+c+e}c=s'\"<s\"'\")?(bG\"',/\"/g):(b=\"'\",/'/@FoG_Gsc,''+b)'6Y=0;$Gm'[Y++];)Z=_$),_=Z`Z.pop()@e(_)'zs=SX to '+iX ('+(qi-S)X, '+((i/S*1e4|0)/100)+'%)'} ById('.replace(.nerHTML rowF12 colF80></>\\.lengthfor(.split( s.dexOf( document.getElement ^.ueL=functionP{')i-/g,'if(K x,j+t)=LP|A;textareaval+b+ id=]))break;&&inscript#button5/.*(?=6;@);D/Fs=G='Kj=P(s)V++)Wo[xX+'B^<br><`.jo(qi=z;i";for(Y=0;$="zq`^XWVPKGFD@65# "[Y++];)Z=_.split($),_=Z.join(Z.pop());eval(_)

Description

JavaScript crusher with UI and a demo run on its own uncrushed source - all of that in 1024 bytes. This is an improved version of the original crusher which was made for crushing my first js1k entry, a Tetris clone. Special features: + Unicode support + Size reported in actual bytes, not chars + Optimal output for both single/double quotes + Strips single-line comments, indentation, newlines + Demo run on its own source code Special thanks to @tpdown's for competition and ideas for additional byte savings.

Original source

Uncrushed source included in demo. Development source differs only by indentation and newlines.