Vue.js version

1.0.17

Reproduction Link

https://jsfiddle.net/4300L6uz/

Steps to reproduce

1)in a custom-element, add extra space at end of class attribute, eg class="p1 p2" => class="p1 p2 "

I have not checked other attributes. the problem may exist in them as well.

What is Expected?

Vue should trim the extra spaces and proceed silently

What is actually happening?

Vue throws syntax error, which halts the app.

The workaround: trim those extra spaces. This problem is very trivial, but its effects are not.