<body> <div id="top" class="appear"> <header> <h1>CSS animation <span class="appear d1">only once</span> <span class="appear d2">at</span> <span class="appear d3">page beginning.</span></h1> </header> <div class="appear d4"> <p>Animation for attention the content. <span class="appear d6">Elegantly,</span> <span class="appear d8">Modestly,</span> <span class="appear d10">Delay a timing on purpose.<