Bokeh 3.0 Iteration Plan #12527

mattpap · 2022-04-27T10:04:53Z

mattpap
Apr 27, 2022
Maintainer

This document outlines the timeline and tasks to accomplish for Bokeh 3.0 major release.

Drop support for legacy (pre ES6) browsers, in particular IE. Remove polyfills and migrate to modern APIs. Establish minimal viable versions of major web browsers supported by bokehjs. Possibly establish a scheme for rolling phaseout of obsolete versions.
Robustify serialization protocol and related APIs. Introduce a robust intermediate (serializable) representation. Allow for universal handling of binary buffers. Possibly add support for fully binary protocol.
Modularize bokehjs' CSS. Migrate to shadow DOM and isolate each bokehjs components' styles. Establish an "API" for defining robust themes for external usage.
Make bokeh's layout interoperate with CSS better. Respect DOM/CSS instead of working around it. Focus on performance of large dashboards and ease of embedding into existing HTML/CSS.
Robustify in-canvas positioning schemes. Add support for sub-coordinates and mapping between coordinate systems. Allow multiple plots on a single canvas and arbitrary positioning of frames. (postponed to 3.1)
Further robustify WebGL-based rendering backend. Focus on the robustness of the implementation and coverage of previously not implemented cases (glyphs, hatch patterns, line joints, etc.).

mattpap · 2022-04-27T10:12:57Z

The remaining sub-tasks to finalize the release:

Establish a migration path and/or compatibility mode after CSS modularization (see Stability of new DOM #12082).
Finalize layout redesign (Redesign the layout using CSS and canvas layouts #11915).
Update jupyter-bokeh (etc.) to work with the serialization changes implemented so far.
Widget tooltips and general improvements to components and widgets (Generalize tooltips and add description to widgets #12154).
~~Finalize canvas/positioning redesign (Redesign canvas, painting, positioning and UI events #12083).~~ (postponed to 3.1)

Stretch goals:

~~Add fully binary serialization protocol (Add support for binary serialization #12043).~~ (postponed to 3.x)

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