function _initHolder(mode) {
        setSanitizedContent(holder, "");
        holder.setAttribute('mode', mode);
        holder.style.display = "";
    }
Click element or create hints for elements to click.

@param links `string or array of HTMLElement`, click on it if there is only one in the array or `force` parameter is true, otherwise hints will be generated for them. If `links` is a string, it will be used as css selector for `getClickableElements`.
@param {boolean} [force=false] force to click the first input element whether there are more than one elements in `links` or not.
@name Hints.click

@example
mapkey('zz', 'Hide replies', function() {
    Hints.click(document.querySelectorAll("#less-replies:not([hidden])"), true);
});