Semantic elements
<header> <hgroup> <nav> <article> <section> <aside> <time> <mark> <footer>
Form controls
New controls:
<input type="email" /> <input type="url" /> <input type="date" /> <input type="time" /> <input type="datetime" /> <input type="month" /> <input type="week" /> <input type="number" /> <input type="range" /> <input type="tel" /> <input type="search" /> <input type="color" />
New attributes:
autofocus
min
max
pattern
placeholder
required
step