Display oxygen reserve

[MartinDelille]

Below the depth graph display the percentage of oxygen. An infography would be fine but let's start with text.

[divarvel]

See a28045a

[MartinDelille]

It's stuck on loading.

[divarvel]

On Safari (if yes, that's because I use fetch)? are there errrors in logs?

[MartinDelille]

Yes on Safari:

[Error] ReferenceError: Can't find variable: fetch
    fetchJson (main.js:27)
    global code (main.js:30)