Disables control-f results, text selection, and all other interaction for any bit of text.

jquery.shadow.js

(function ($) {
    $.fn.shadow = function () {
        this.each(function () {
            var text = this.innerText;
            this.createShadowRoot()
                .innerHTML = "<style>:host::after{content:'" + text + "'}</style>";
        });

        return this;
    };
    $.extend({
        shadow: function (selector) {
            return $(selector).shadow();
        }
    });
})(jQuery);

//Usage
$.shadow(".shadow");
//or
$(".shadow").shadow();

shadowfind.js

(function () {
    var shadows = document.getElementsByClassName("shadow");

    Array.prototype.forEach.call(shadows, function (el) {
        var text = el.innerText;
        el.createShadowRoot()
            .innerHTML = "<style>:host::after{content:'" + el.innerText + "'}</style>";
    });
})();

test.html

<p>
    This is some text that has a <span class="shadow">hidden</span> word that can't be found using control-F!
</p>