v1.28.0

Added

• Allow constraints by domain on cartesian axes using new axis attributes:
  constrain: 'domain' and constraintoward [#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]

Changed

• 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]

Fixed

• 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]