- Allow constraints by domain on cartesian axes using new axis attributes:

`contrain: 'domain'` and `contraintoward` [#1767]

- Add gl3d annotations [#1638, #1786]

- Add support for lasso and select `dragmode` on `scattergl` traces [#1657]

- Add 48 new `scattergl` marker symbols (for total of 56) [#1781]

- Add array support for `hoverinfo` [#1761]

- Add animation support for `fillcolor` attribute [#1722]

- Add `colorscale` attributes to `mesh3d` traces [#1719]

- Add support for target and popup attributes pseudo-html text links [#1726]

- Add per-`direction` updatemenu dropdown arrows [#1792]

- Add `execute` attribute to sliders and updatemenus to skip method calls while

still triggering associated events [#1700]

- Add `skip` value to the `method` attribute for sliders and updatemenus which

acts as a no-op [#1699]

- Include values of all array attributes in hover/click/select event data

including `ids` and `customdata` [#1770]

- Make gl2d axis tick labels on-par with SVG versions [#1766]

- Build SVG text nodes directly instead of using `DOMParser` [#1783]

- Rework transform style into array syntax [#1794]

- Recompute hover on click to increase click robustness [#1646]

- Miscellaneous performance improvements including improved bounding box caching

and adding a few short-circuit [#1772, #1792]

- Fix pan/zoom for layout component linked to `category` axes [#1748, #1791]

- Fix non-`linear` gl3d axis range settings [#1730]

- Fix `ohlc` and `candlestick` when open value equals close value [#1655]

- Fix annotations positioning when MathJax symbols are present [#1788]

- Fix array values in event data for transformed traces [#1717, #1727, #1737]

- Fix relayout event data for gl3d camera interactions [#1732]

- Fix scatter markers and text nodes linked to `ids` ordering on updates [#1709]

- Fix `Plotly.validate` for dynamic enumerated attribute

(e.g. axis `anchor`, `overlaying`) [#1769]

- Fix pseudo-html handling in sliders, updatemenus, range-sliders,

range-selectors and carpet traces [#1792]

- Fix annotation bounding box and arrow heads in IE [#1782]

- Fix svg exports in IE for graphs with multiple clip paths [#1740]

- Fix `sankey` positioning in IE [#1723, #1731, #1729, #1735]

- Fix relative links in IE [#1715]

- Suppress render warning in gl3d graphs with error bars [#1718]