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LucaColonnello/base-device-font-size.js

Last active August 29, 2015 14:08
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Calculate base font size
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base-device-font-size.js
// device base font size
window.getDeviceBaseFontSize = function( ) {
// check getted yet
if( !window.__baseDeviceFontSize ) {
window.__baseDeviceFontSize = 0;
var iframe = document.createElement( "IFRAME" );
iframe.style.display = "none";
document.body.appendChild( iframe );
var s = "<html><body><"+"/body><"+"/html>";
iframe.contentWindow.document.body.innerHTML = s;
window.parent.__baseDeviceFontSize = Number(getComputedStyle(iframe.contentWindow.document.body, '').fontSize.match(/(\d+(\.\d*)?)px/)[1]);
document.body.removeChild( iframe );
}
return window.__baseDeviceFontSize;
};
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