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// SOURCE: https://gist.github.com/addyosmani/fd3999ea7fce242756b1
 
// Use $$ if your browser aliases it:
// ~ 108 byte version
[].forEach.call($$("*"),function(a){a.style.outline="1px solid #"+(~~(Math.random()*(1<<24))).toString(16)})


// Using document.querySelectorAll:
// ~ 131 byte version
[].forEach.call(document.querySelectorAll("*"),function(a){a.style.outline="1px solid #"+(~~(Math.random()*(1<<24))).toString(16)})