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window.onload = function() {
// Force a reflow before any changes.
document.body.clientWidth;
var elems = document.querySelectorAll('[data-insert]');
Array.from(elems).forEach(function(e) {
var parent, ref;
switch (e.dataset.insert) {
case 'start':
parent = e;
ref = e.firstChild;
break;
case 'end':
parent = e;
ref = null;
break;
case 'before':
parent = e.parentNode;
ref = e;
break;
case 'after':
parent = e.parentNode;
ref = e.nextSibling;
break;
}
var elem, textnode;
if ('text' in e.dataset) {
textnode = document.createTextNode(e.dataset.text);
}
if ('tag' in e.dataset) {
elem = document.createElement(e.dataset.tag);
if (textnode) {
elem.appendChild(textnode);
}
}
parent.insertBefore(elem ? elem : textnode, ref);
});
};
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