 button</button>
    <button class="interactive">another changing button</button>
    <button class="interactive">3rd changing button</button>
    <button class="both">both</button>
    <button class="both">another both</button>
    <button class="mdown">click adds class removed by mousedown</button>
    <button class="mdown">mdown</button>
    <input id="input-placeholder" type="text" value="placeholder" />
    <button id="assertions-1" class="container container-wide" value="submit1" type="button" data-ch