1594948 - [Experiment] Staged Rollout: Gradual rollout of <meta viewport> support in RDM Fx 72.0 to 72.0 Release

Status: RESOLVED FIXED

(Shield :: Shield Study, task, P3)

Description

[Experimenter Bot]

Gradual rollout of <meta viewport> support in RDM

<meta viewport> tags make webpages adapt nicely to mobile device viewports.

RDM is our desktop-based tool to simulate mobile devices. It is very important to web developers since they spend most of their time developing and debugging on desktop browsers before testing on actual devices.

Bug 1521921 is the meta bug that tracks the proper handling of <meta viewport> in RDM.

Once all of the bugs we track in the MVP for this project are done, we want to ship this new feature to our user base.

We would like to do a gradual rollout of this feature in release to ensure stability before enabling this to the entire population.
Proper handling of this feature is difficult, and we want to test the waters before enabling the feature to everybody.

Originally filed as a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1580419

• Start date: When Firefox 72 hits release.
• People:
  Product Manager: Martin Balfanz
  Engineering Manager: Patrick Brosset
  Engineer: Brad Werth
• Target audience:
  Minimum Firefox Version: Firefox 72
  Language: All
  Platform (Windows, Mac, Linux): All
  Region: All
• FeatureGate: NO
• Pref to flip: devtools.responsive.metaViewport.enabled
  BEFORE: false
  AFTER: true

This feature is toggleable at runtime with the pref mentioned before. It does not need a restart.

How will we check for success? Unfortunately, there is no telemetry probe or crash rates we can check. The problems we expect are visual. Websites rendered in the RDM viewport might not be zoomed in, or panned, or centered correctly. Only the users will know if RDM truthfully renders their sites like on mobile devices. We therefore intend to rely on incoming bug traffic to decide whether we should continue with the rollout or turn the feature off.

In terms of playbook, this is probably a lower risk one. At least at this point in time, we are not aware of webcompat or stability problems. We will know more in beta 71 (where QA will perform a new test run).

Experimenter is the source of truth for details and delivery. Changes to Bugzilla are not reflected in Experimenter and will not change delivery configuration.

More information: https://experimenter.services.mozilla.com/experiments/gradual-rollout-of-meta-viewport-support-in-rdm/

Comment 1

[Experimenter Bot]

Start Date: 2020-01-14 End Date: 2020-01-29

Comment 2

[Julien Cristau [:jcristau]]

Looks like this is at 100% as of a week ago.