Clarifications re: experiments

[rudygalfi]

A question and few requests regarding AMP experiments.

Question: Is changing the settings at https://cdn.ampproject.org/experiments.html == using the console to do AMP.toggleExperiment('experiment-name')? If so, why does it seem like these are out of sync for me?

Requests:

[1] https://github.com/ampproject/amphtml/blob/master/tools/experiments/README.md says

Experiments UI is a available at:
https://cdn.ampproject.org/experiments.js

but it should say:

Experiments UI is a available at:
https://cdn.ampproject.org/experiments.html

[2] More info regarding the dev channel is not properly linked from https://cdn.ampproject.org/experiments.html. It should link to:

https://github.com/ampproject/amphtml/blob/master/DEVELOPING.md#amp-dev-channel-experimental

[dvoytenko]

I fixed (1) and (2) in #1069.

Which URL are you trying to call AMP.toggleExperiment on? The experiment control is per-domain. The experiments.html page enables it for cdn.ampproject.org. AMP.toggleExperiment enables it for the current domain.

[rudygalfi]

@dvoytenko Thanks for the fixes!

The URL was theguardian.com. Your explanation makes sense and answers my question.

I think the docs can be better. Something like:

An experiments UI is a available at to enable or disable content served from https://cdn.ampproject.org:
https://cdn.ampproject.org/experiments.html

For content served from any other domain, experiments can be toggled in the devtools console when development mode is enabled using:
AMP.toggleExperiment('experiment name')

[dvoytenko]

#1070 is assigned to you for review.