\xa0 not interpreted as a space.

```
    html5lib.HTMLParser(html5lib.treebuilders.getTreeBuilder('dom'), strict=True).parseFragment('<img src="/test.jpg">')
```

if the space between `img` and `src` is actually a `\xa0` byte, then strict mode throws an 

```
    ParseError: Unexpected character after / in tag. Expected >
```
Error, which isn't very helpful.