form.onsubmit = function XY(e) { e.prevenDefault(); … }

    <input type="text" name="someName" required="required" class="toBeCleared"/>

    if(e.currentTarget.elements["someName"].className === "toBeCleared") {
      e.currentTarget.elements["someName"].value = '';
    }

I have some background form submission implemented. Similar to <pre><nowiki> form.onsubmit = function XY(e) { e.prevenDefault(); … }</nowiki></pre> In form there is (similar) input <pre><nowiki> <input type="text" name="someName" required="required" class="toBeCleared"/></nowiki></pre> Then there is (similar) JS. <pre><nowiki> if(e.currentTarget.elements["someName"].className === "toBeCleared") { e.currentTarget.elements["someName"].value = ''; }</nowiki></pre> Everything works as expected except that in FF after all work is done the field is marked with red color as not validated (since it is empty and required). Return false, true from body of handler has no effect on this.