If I have custom tags in my HTML where the name of the tag starts with nav, then HTML5 outliner seems to think this is a nav element and therefore it expects a name to be set. This must be wrong, isn't it?

<nav-bar>
    <nav-megamenu></nav-megamenu>
    <nav-megamenu></nav-megamenu>
    <nav-megamenu></nav-megamenu>
</nav-bar>