Finding more extensive chess opening diagrams; What to google?

I want to find more extensive chess opening(s) than the diagram you see on this link: Chess.com: Ruy-Lopez-Opening.

What I often miss in the chess.com diagrams is the answer that follows.

For example: This diagram 'Open Spaans' (*), also shows how Black responds to Bf1-a6.

(*) Dutch for 'Open Spanish'

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So what to google, to find more chess diagrams with arrow-keys.

Is there a file-extension for arrow-key diagrams? As there are file extensions for pdf, jpg, png, gif, ectc. 

I already looked at the source code of the page. But couldn't find it yet.

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I find more than enough videos on Youtube. But I also want to be able to follow it from move to move with arrow keys.

But the diagram does show how black responds. 3..a6 is the most common, followed by all the other responses down the line.

After you click on 3..a6, you can see that in almost 91,000 games, white retreated his bishop to a4 and so on.

If I hover over the white / gray / black bars with percentages on the right; Then I do indeed see moves, which I assume should be the most likely. I'm starting to understand now...

Thank you for your insightful answer.

For the rest: If someone has a hint; How to google chess diagrams with arrow-keys; That remains interesting!

... Chess.com is fine.
But what I was looking for; Chess diagrams, with arrow keys, and extensive analysis; I found it here: SimplifyChess.com