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  • puppeteer-alpha planning session (mmucci)
    • Team will select the MVP backlog based on a review of the team completion speed and forecast schedule
  • Fission (ato)


whimboo, AutomatedTester, mmucci, digitarald


Update on puppeteer-alpha progress

[Starts at 00'09" in the recording.]



mmucci gave a summary of the project’s velocity so far, based on four weeks of work:

  • 29 bugs in the backlog, 11 are in development, 18 listed as available
  • Our team’s completion date is 1.6 days per bug
    • This is really fast, considering we only have three engineers
  • Two scenarios:
    • Fixed-day: up to 20th December (20 working days from now)
      • Whatever is left over gets thrown into Milestone 2 (M2)
      • Would mean a commitment of two more bugs to deliver before 20th December
    • Complete entire backlog: 29 bugs + 8 contingency bugs
      • Estimate would be 60 work days (around 6th March) to complete
      • Holiday time/PTO over Christmas, all-hands, &c.


  • mmucci’s preference would be scenario #2 to complete the whole backlog scope into consideration
  • AutomatedTester’s preference would be scenario #1 and fixed dates and move overflowing things into an M2
    • Concerned that we think we have everything, but this project has shown a number of times that things take longer than expected due to unforeseen work
    • A flexible, feature-driven approach may be pushed further back due to unforeseen work
  • ato’s doesn’t have a preference
    • Which scenario we pick isn’t going to impact how quickly we will get to what we consider to be MVP quality
    • We will get N amount of work done, question is how we want to frame it
    • Perhaps scenario #1, with a fixed end date, will give a sense of completion
  • Concern that what we will have by end-of-year (20th December) won’t have the necessary features required to have something to put into the hands of users
    • General acknowledgement that there are many ‘known-unknowns’
    • CDP API is under-specified, Puppeteer has a non-exhaustive testsuite, lack of CDP conformance testsuite
    • This makes the work highly incremental, in that you don’t know you’re missing something until you add some feature only to discover there is another blocker preventing the Gutenberg testsuite from running to completion
    • It was called out that whimboo has done a great job at documenting/organising which methods and events are used by Puppeteer and Gutenberg, and that this has helped planning tremendously
    • It was suggested by AutomatedTester that we may want to shift focus of what that MVP is to the core use cases and examples, and document deficiencies and where we lack certain features
    • AutomatedTester is concerned that scope will grow and grow if we focus too much on supporting Gutenberg fully, and that the unknowns will cause estimate to slip further back than March
  • AutomatedTester is writing a blog post announcing Puppeteer support in Firefox for hacks.mozilla.org
    • Concern that a blog post saying “look, we can run 5% of Gutenberg” isn’t necessarily good publicity
  • Suggestion that we have a fixed end-date for puppeteer-alpha, then make the next milestone (M2) “feature-driven” and flexible
    • mmucci confirms that would not be a problem
    • This means we are committing to delivering 12 bugs before 20th December
    • 10 of these are already in development/in review, which means we have two complete an additional two
  • digitarald noted that whilst a fixed end date gives us a sense of completion, it doesn’t make it any clearer what features we think we will have by end-of-year or what’s remaining
    • The exploratory nature of this project makes it hard to predict what’s remaining
    • Besides reasons given earlier, the biggest uncertainty factor are the meta bugs for APIs we haven’t begun exploring yet
      • Some of these we have found really easy to do, some requiring more work
    • Besides the known-unknowns of the remaining API surface, the biggest unknown-unknown is Fission
    • If we believe there’s significant uncertainty, we just have to be really conservative in our estimation
    • In terms of milestone planning, we are at liberty to break up work into discrete milestones, whether time-bound or feature-bound
    • Networking-related features could also be hard, because we don’t know if we can support all of the APIs in Gecko
  • On the other hand, we some low-hanging fruit that we could support quite easily
    • Cookies and file uploads we know how to do from experience, and there is earlier code in Marionette we could re-use
    • Both turn up in Gutenberg test logs frequently and would likely unblock a significant number of Gutenberg tests
  • mmucci points out that new bugs should now be filed with the puppeteer-alpha-reserve whiteboard entry
    • Further, please make sure you don’t change the whiteboard entry when you assign yourself to any of these bugs and make them P1, as this allows us to track the MVP commitment for 20th December along with anything in development from the reserve backlog
  • ato noted that people external to the project may look at the dashboard and think of it as a metric of how soon we will have Puppeteer support in Firefox done, and due to the number of unknowns there’s a high uncertainty factor that the dashboard doesn’t account for
    • This isn’t a problem with the dashboard per-se, but with the way people perceive it
    • It is a larger engineering and product planning question, but one strategy is to create smaller deliverables that themselves communicate achievement in some area


On whiteboard entries:

Quick question about the backlog. We have the puppeteer-alpha whiteboard entry and the puppeteer-alpha-backlog entry. What is the difference between these?
The backlog, or the reserve bugs, is where we put bugs that it would be good to have if we have time to get to them. But we’re not comitting to completing the reserve backlog.

On the know-unknowns that make out the bulk of the CDP API surface we know we need for Gutenberg, but which has not been explored yet:

Should we simply file implementation bugs for all the metea bugs which are still in the list?
There are 19 bugs in total, so it contributes significant uncertainty to the model.
We keep coming back to the same problem that some of these bugs might be possible to achieve within the scope of a single bug, others might need to be split up in more bugs.
Just keep doing what you’ve been doing up to now.
As you discover bugs, just file them. That’s it.
The velocity tracking takes into account a certain amount of uncertainty already, so you don’t have to do the double work of tracking these separately in temporary bugs.

Planning for puppeteer-alpha

[Starts at 36'03" in the recording.]

  • Due to the low number of remaining bugs we can commit to do, it forces us to be more deliberate about what features we want done in the next 21 working days
  • The main qualifier for which those two bugs are should be, according to AutomatedTester, those “we consider blockers for getting anything running”, for example those that from a product-point of view, can demonstrate bigger impact
  • Some candidates:
    • Page.frameAttached, Page.frameStoppedLoading, missing properties on some of these
    • Some of the Network domain events seem easy, in the sense that they map on to Gecko concepts we already know we can support, and then there are some uncertain ones
      • Fetch.continueRequest and friends could be tricky, but it shouldn’t prevent us from doing the rest that are easy
    • File upload and file chooser picker events
    • Device screen size override
    • Runtime.evaluate and Runtime.callFunctionOn are mostly done, just missing a few properties
    • There’s also a bug maja_zf filed about returned arrays that we need to figure out how to fix, due to the weird way CDP avoids encoding arrays as complex remote object types
  • Some of these are already implemented in Juggler and can be ported over, and others are low-hanging fruit

Action: ato will start document gathering potential candidates for the remaining two must-have bugs we commit to deliver.

Changes to the dashboard

[Starts at 52'23" in the recording.]

  • Dashboard is now set up and ready, and you can keep track of the progress until 20th December using weekly milestones
    • These have completion goals, like how many bugs we need to complete to stay on track
  • Keep adding bugs as normal into the backlog by setting their priority to P3 and tagging them with the puppeteer-alpha-reserve whiteboard entry

Puppeteer upstream changes

  • Movement in the Puppeteer project to move the GitHub repository to a different organisation
    • We were asked to give input on a design document
    • Should not impact open PRs or issues, but will affect the Mozilla Puppeteer fork
    • Besides PR 5137, adding launch support for multiple browsers, getting some more attention we have no concerns


Full recording of the meeting can be viewed here: https://mozilla.zoom.us/recording/share/sg-v9j6px6D0uXH9agp81NtgIZUcfjsqk6RMHG74GyOwIumekTziMw


Status of Milestone 1

  • Last week: 58 Total; 49 Open (84.48%); 9 Resolved (15.52%); 0 Verified (0%)
  • This week: 63 Total; 47 Open (74.6%); 16 Resolved (25.4%); 0 Verified (0%)


% git log --date=iso --pretty=format:'%ad%x09%H' -- remote/ | awk '$0 >= "2019-11-08" && $0 <= "2019-11-22"' | awk -F $'\t' '{print $2}' | xargs git show -s --format='%h%x09%an%x09%s'
403f5174fa8b    danwalsh99      Bug 1590358 - [remote] Replace static assertions in browser chrome tests with info(), r=remote-protocol-reviewers,whimboo
5b69de0c56dd    Henrik Skupin   Bug 1597253 - [remote] Implement Page.lifecycleEvent. r=remote-protocol-reviewers,maja_zf
406a93df2565    Henrik Skupin   Bug 1597259 - [remote] Implement Page.setLifecycleEventsEnabled. r=remote-protocol-reviewers,maja_zf
cdd041f00f8b    Henrik Skupin   Bug 1597643 - [remote] Implement Page.frameStartedLoading. r=remote-protocol-reviewers,maja_zf
2806988dc9de    Oana Pop Rus    Backed out changeset 4f9ddcc4d7d0 (bug 1590358) for mochitest remote failures in browser_dispatchMouseEvent.js on a CLOSED TREE
5fe13519267e    Daniel Varga    Backed out 9 changesets (bug 1543115) for build bustage with  fatal error: 'nsIRemoteAgent.h' file not found. On a CLOSED TREE
2487e6b4b571    danwalsh99      Bug 1590358 - Replace static assertions in browser chrome tests with info(), r=remote-protocol-reviewers,whimboo
28f0e7732405    Andreas Tolfsen bug 1543115: remote: bootstrap from Rust; r=remote-protocol-reviewers,maja_zf
baf8d56e5e8d    Andreas Tolfsen bug 1543115: remote: expose nsIRemoteAgent as XPCOM service; r=remote-protocol-reviewers,maja_zf,nika
da954749af68    Andreas Tolfsen bug 1543115: remote: introduce nsIRemoteAgent XPIDL interface; r=remote-protocol-reviewers,maja_zf
7efc45e86091    Andreas Tolfsen bug 1543115: remote: make RemoteAgent.listen() accept strings; r=remote-protocol-reviewers,maja_zf
995a3780df11    Andreas Tolfsen bug 1543115: remote: emit "remote-listening" system notification on startup; r=remote-protocol-reviewers,maja_zf
67b229daf2a1    Andreas Tolfsen bug 1543115: remote: set needed prefs earlier at startup; r=remote-protocol-reviewers,maja_zf
e669988e2ecf    Andreas Tolfsen bug 1543115: remote: make RemoteAgent.close() safer; r=remote-protocol-reviewers,maja_zf
4947f164e928    Andreas Tolfsen bug 1543115: remote: merge init() and listen(); r=remote-protocol-reviewers,maja_zf
172bcc1b5b57    Andreas Tolfsen bug 1543115: remote: rename XPCOM manifest for conformity; r=remote-protocol-reviewers,maja_zf
a59b794ae396    Henrik Skupin   Bug 1596101 - [remote] Forward Network.setUserAgentOverride to Emulation.setUserAgentOverride. r=remote-protocol-reviewers,maja_zf
e75ec56044f9    Henrik Skupin   Bug 1595697 - [remote] Implement basic support for Emulation.setUserAgentOverride. r=remote-protocol-reviewers,maja_zf
b53b2cf3a6e1    Henrik Skupin   Bug 1595112 - [remote] Cache chrome-remote-interface.js between browser chrome tests. r=remote-protocol-reviewers,ato
5262b3ae833e    Henrik Skupin   Bug 1595112 - [remote] Import minimized version of chrome-remote-interface.js. r=remote-protocol-reviewers,ato
516b7a7772ac    Andreas Tolfsen bug 1596729: remote: document ObserverService logging
b81d4de69c1a    JaStenson       Bug 1591989 - [remote] Don't use 'frameId' for Page.loadEventFired event. r=whimboo,remote-protocol-reviewers
0486956b45c4    Henrik Skupin   Bug 1595528 - [remote] Add local Chromium folder to ignore list. r=remote-protocol-reviewers,maja_zf
8db2d809aaea    Henrik Skupin   Bug 1595528 - [remote] Vendor in latest puppeteer changes. r=remote-protocol-reviewers,maja_zf
43ee49b7bca7    Henrik Skupin   Bug 1594871 - [remote] Callers of loadURL() in browser_captureScreenshot.js have to use await. r=remote-protocol-reviewers,ato
e6162a2415b4    Maja Frydrychowicz      Bug 1590467 - Use new testing options in puppeteer-test mach command; r=remote-protocol-reviewers,ato
79b5906c8b68    Maja Frydrychowicz      Bug 1590467 - Updated vendored puppeteer with proposed browser selection; r=remote-protocol-reviewers,ato


Development status of Puppeteer alpha
Puppeteer alpha dashboard
Bugzilla queries
All project work currently in development
Available MVP work
Completed MVP work
Bug overviews
Gutenberg dependency tree
Puppeteer examples dependency tree
Complete Puppeteer dependency tree
All ze boogs

PTO (🍂)

  • whimboo away Wednedsay 20th November for public holiday
  • ato PTO half-day on Thursday 21st and 22nd November