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Function to render only a particular element in PhantomJS
function renderElement(page, selector) {
var prevClipRect = page.clipRect;
page.clipRect = page.evaluate(function(selector) {
return document.querySelector(selector).getBoundingClientRect();
}, selector);
var pic = page.renderBase64('png');
page.clipRect = prevClipRect;
return pic;
if (module && module.exports) module.exports = renderElement;
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