: Chrome prerender "Non-Empty Browsing Instance" I'm experimenting with Chrome rel="prerender". On one specific site, the page I'm suggesting gets prerendered, but is then loaded again, not switched

@Samaraweera270

Non-Empty Browsing Instance appears if you have 2 windows of Chrome open. Keep a single window open and you will not get this error.

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@BetL925

After experimenting and fixing it, the "Non-Empty Browsing Instance" seems to be triggered by JavaScript changing DOM in the prerendered page.
The way to solve it is to block such JS until the document is visible. Hint:

var visibility = {
isHidden: function() {
if ('hidden' in document) return document.hidden;
return false;
}
};

if (visibility.isHidden()) document.addEventListener('visibilitychange', startWhenVisible);
else startStuff();

function startWhenVisible(){
if (!visibility.isHidden()) {
document.removeEventListener('visibilitychange', startWhenVisible);
startStuff();
}
}

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