Re: [w3c/webcomponents] <iframe> and the History API (#184)

To pose the problem in a flipped way, after the following user-initiated (click on link) navigation
happend in the [demo](https://takayoshikochi.github.io/tests/005_iframes.html), assuming
each iframe were in the Shadow DOM.

Entry1: A1
Entry2: A2 + B1 + C1
Entry3: A2 + B1 + C2
Entry4: A2 + B2 + C2

Each history object has the following list:

A: [A1, A2] current index = 1
B: [B1, B2] current index = 1
C: [C1, C2] current index = 1

then `history.back()` is executed in frame C, each history object looks like:

A: [A1, A2] current index = 1
B: [B1, B2] current index = 1
C: [C1, C2] current index = 0 (showing C1 content)

What will happen for each frame and each history object if browser UI's back/forward button
is pressed?
(again, this may be out of scope for the HTML spec, but everyone here has to implement something for each browser :)

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