I'm wondering if this construction would be semantically correct in HTML5.

<html>
<head></head>
<body>
    <aside>
        <header>
            <h1></h1>
        </header>
        <div>

        </div>
    </aside>
    <section id="content">

    </section>
</body>
</html>

What I want is a left bar taking the 30% of the screen, with the logo and some stuff below it, and then the content taking the other 70% on the right side.

Thanks a lot.

html header semantics
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