some attributes are only set if SSR is used

[jimfb]

Maybe we don't care, but some attributes are currently only set if SSR is used.

http://jsfiddle.net/8ftyu8eq/

Not sure if it's worse than the old behavior (which was different for initial render as compared to subsequent renders). But this could be a tricky one for people to debug if they hit it, since it depends on a more subtle difference (SSR vs CSR); I imagine people frequently fail to test their components on SSR, so the difference is more likely to catch them by surprise.

[zpao]

CSS selectors use the DOM attribute. Now that we aren't generating the markup and inserting, initial values are also set the same way that they were for updates. value uses the property, not the attribute. Unless everything is set via the attribute (which isn't 100% possible) then we'll need to have some cases that aren't possible to catch. But we could potentially start using attributes for everything that is possible. cc @spicyj

[sophiebits]

For value, this is essentially a dupe of #4618.

Gonna call style a wontfix.