<ins> only with NOTE section needs different styling

[arai-a]

https://arai-a.github.io/ecma262-compare/?pr=3450&id=sec-speciesconstructor

similar to #87, but the case where a NOTE section is enclosed by <ins>,
Given <ins> is styled with background, if the child content has its own background for the entire content, the <ins>'s background color is not visible.

we should for example:

• add margin/padding between <ins> and the inner block elements
• add border or something
• use different background color for note section if it's inside ins/del

[arai-a]

Actually, the background color is already inherited for things inslide ins/del.
The issue here would be that the background color is almost same between ins and NOTE section