Global usage percentage seems wrong

[styfle]

While viewing the webp feature, I noticed total global usage listed at 93.21% support today.

That means that 6.79% of browsers don't support webp today.

However, there is a large discrepancy when adding up all the unsupported red versions.

0.56 + 0.12 + 0.07 + 0.54 + 0.03 + 0.69 + 1.32 + 0.08 = 3.41%

So 6.79% of browsers don't support webp but only 3.41% of those are in the chart.

Where is the other 3.38% attributed to? Other, less popular browsers?

[Sora2455]

If look at the dropdown above the usage percentages, you'll see the options are "all users", "all tracked", "tracked mobile" and "tracked desktop".

If you set the dropdown to "all tracked" in this case, the global percentage changes to 96.48%, which matches up with your unsupported percentage if you allow for a 0.01% rounding error. So the answer to where the other 3.38% come from is that they aren't "tracked" browsers - presumably being browsers that CanIUse doesn't track the support status of.

Personally I just look at the tracked browser percentages and assume they're roughly representative of even the un-tracked browser support.

[styfle]

I see. I guess the confusing part is that untracked is the default selection (all users) but the chart doesn’t represent that, only tracked.

So perhaps when all users is selected, the chart could have an additional bar to represent “other” browsers.

[willrowe]

It would be nice to at least have an % of filtered option. I was under the impression that the usage percentages at the top right of each feature was an overview of the data currently being shown, but it does not adjust when filtering the browsers. This is quite confusing and seems like a disconnect as far as the interface goes.