Pseudo element new

[hyunjunekim]

Hi, This is pseudo node. We take effort to make simple.

Step 1. Create Pseudo Node which are before or after.
Step 2 - 1. If Before, Insert Pseudo Node in Current Node Data.
- 2. If After and exist last child, Insert Pseudo Node in Last Child Node Data(next_after_sibling)
- 3. If After and not have child, Insert Pseudo Node in Current Node data.
Step 3 -1 If exist Before when call first_child function, return before node after link first_child, after or not.
- 2 If only exit after, return after
- 3 If don't have any pseudo element, return first_child of current node.
Step 4 - 1 If exist next_after_sibling when call next_sibling function, return next_after_sibling node
- 2 If not have next_after_sibling, return next_sibling of current node.

[highfive]

Warning

• These commits modify unsafe code. Please review it carefully!
• These commits modify layout code, but no reftests are modified. Please consider adding a reftest!
• @hyunjunekim, please confirm that src/test/html/acid1.html and your favourite wikipedia page still render correctly!

[jdm]

after

[sammykim]

Rebase. and We do not use fn before_style and fn after_style anymore.

[hyunjunekim]

@jdm r?

[hoppipolla-critic-bot]

Critic review: https://critic.hoppipolla.co.uk/r/864

This is an external review system which you may optionally use for the code review of your pull request.

In order to help critic track your changes, please do not make in-place history rewrites (e.g. via git rebase -i or git commit --amend) when updating this pull request.

[jdm]

I am reviewing on Critic, and half complete.

[jdm]

Critic review is finished.

[jdm]

If you push further changes, please make sure they are additional commits on top of your existing ones so they do not cause Critic to break.

[hyunjunekim]

@jdm Thank you for your review. :)

[hyunjunekim]

@jdm Wow, Removed 'AbstractNode'. I'll try again implement for pseudo node.