PSA: SPv175 is launching

[Chris Harrelson]

Hi all,

The next phase of Slimming Paint is scheduled to launch in M66. It's being tracked in this issue.

In this launch we will;

* start painting using PaintChunks + property trees, rather than using paired display items

* invalidate raster based on PaintChunks instead of LayoutObjects

This is another big milestone that will roll out a lot more of the SPv2 machinery. There should be no new performance or correctness regressions.

Earlier today, the flag was flipped to experimental mode; later today it will be flipped to stable. Please file a bug if you see any bug related to painting or raster, or any performance regressions, with component Blink>Paint.

Thanks,

Chris

[Jeremy Roman]

Awesome; good luck! :D

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[Joe Medley]

Chris,

Can you think of anything related to this that web developers should know about?

Joe

[Chris Harrelson]

There are a few bugs that will be fixed as a result of this rollout, as a consequence of fixing certain architectural problems.

The most prominent is crbug.com/771852 (positioned elements under SVG <foreignObject> are now correctly positioned).

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[Chris Harrelson]

Update: SPv175 didn't make M66 (we ended up spending a lot more effort making sure RLS shipped in that version).

SPv175 is back on for M67 and we expect it to ship in that release.

On Mon, Feb 26, 2018 at 9:31 AM Chris Harrelson <chri...@google.com> wrote:

There are a few bugs that will be fixed as a result of this rollout, as a consequence of fixing certain architectural problems.

The most prominent is crbug.com/771852 (positioned elements under SVG <foreignObject> are now correctly positioned).

On Mon, Feb 26, 2018 at 8:50 AM, 'Joe Medley' via blink-dev <blin...@chromium.org> wrote:

Chris,

Can you think of anything related to this that web developers should know about?

Joe

On Friday, February 16, 2018 at 2:16:17 PM UTC-8, Chris Harrelson wrote:

Hi all,

The next phase of Slimming Paint is scheduled to launch in M66. It's being tracked in this issue.

In this launch we will;

* start painting using PaintChunks + property trees, rather than using paired display items

* invalidate raster based on PaintChunks instead of LayoutObjects

This is another big milestone that will roll out a lot more of the SPv2 machinery. There should be no new performance or correctness regressions.

Earlier today, the flag was flipped to experimental mode; later today it will be flipped to stable. Please file a bug if you see any bug related to painting or raster, or any performance regressions, with component Blink>Paint.

Thanks,

Chris

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[Joe Medley]

Hi Chris,

Is this going to make 67?

Joe Medley | Technical Writer, Chrome DevRel | jme...@google.com | 816-678-7195

If an API's not documented it doesn't exist.

[Chris Harrelson]

Hi Joe,

Yes, this will make M67. At this point we have fixed basically all of the blocking bugs.

Also, in terms of developer impact, a side-effect of the code improvements in this launch is

that a wide class of bugs having to do with positioning and sizing of HTML content underneath

a <foreignObject> element will be fixed (*).

Chris

 (*) Note: This is different than the change to make <foreignObject> a stacking context.