Section id with special characters

[Peque]

Currently, if a section id has special characters (i.e.: é, à, ü, ø...) then:

1. The special characters are not displayed in the URL bar. Why?
2. If you execute grunt serve and modify the HTML file while displaying that section in the browser, it will automatically jump to the first slide, instead of displaying the same slide after the edit. Is not this a bug?

Content example:

  <div class="reveal">
    <div class="slides">

<section id="ascii-text">
  <h1>ASCII text</h1>
</section>
<section id="ømq">
  <h1>ØMQ</h1>
</section>

    </div>
  </div>

[schauder]

At least when an id starts with a digit this will break the navigation. The second slide will be skipped in the following presentation when navigating with the space bar:

    <section>
        <section id="one"><h2>shows</h2></section>
        <section id="2-two"><h2>Gets skipped</h2></section>
    </section>
    <section>
        <section id="three"><h2>Shows to early</h2></section>
    </section>

While this is probably the same issue, it makes it much more grave, since it breaks pretty normal presentations

[schauder]

This might be related to #1230

[bnjmnt4n]

Closing this as a duplicate of #1230.