js/src/cross_framing_protection.js


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/**
 * Conditionally included if framing is not allowed.
 * @return {void}
 */
const crossFramingProtection = () => {
    if (window.allowThirdPartyFraming) {
        return;
    }

    if (window.self !== window.top) {
        window.top.location = window.self.location;
        return;
    }

    const styleElement = document.getElementById('cfs-style');
    // check if styleElement has already been removed to avoid frequently reported js error
    if (typeof (styleElement) === 'undefined' || styleElement === null) {
        return;
    }

    styleElement.parentNode.removeChild(styleElement);
};

crossFramingProtection();