project:add book marks with html

thinking list:

1.locate the position of your document wherever you arrived(know where are you now;

2.insert of something that i will use  in 3 places:

a.in html page

b.in indexdb database:read write it

c.in side bar

it should be unique key.

so how can i finish this？？？

method 2:

1.dived the page one by one

2.create a document page table with unique key

3.add bookmarks and notes into of them.