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htmltools

DEVOPS
Velocity0.0

Tools for creating, manipulating and rendering HTML from R

github.com/rstudio/htmltools ↗

htmltools spends three releases walking back its own fill-layout opinions

shinycsslayoutmaintenancehtml-generation
◆Current state
htmltools generates the HTML that Shiny, bslib and R Markdown emit. Recent releases are dominated by one project - the fill and fillable layout system that powers bslib cards - being tuned release after release, surrounded by fixes for whatever testthat or R-devel changed underneath.
◆Where it's heading
The fill work is converging rather than expanding: 0.5.6 stopped forcing overflow on fillable containers, 0.5.7 stopped forcing full width on fill items, and 0.5.8 lowered the CSS's precedence by moving it into a named cascade layer. Each step removes an opinion that broke someone's layout. The two most recent releases add nothing at all beyond test compatibility.
◆Prediction
With the fill CSS now scoped to its own cascade layer, expect fewer layout corrections and a continued pattern of small releases driven by testthat and R-devel rather than new API.

◆Recent moves

  1. 8mo ago

    Test fix for testthat 3.3.0

    A one-line test fix for testthat 3.3.0 - the release exists to keep checks green. Nothing user-visible, and the second consecutive release of that kind.

    View source ↗
  2. 8mo ago

    capturePlot() examples run only interactively

    Example code for capturePlot() is now gated behind an interactive-session check, a concession to the check environment rather than a change to the function itself.

    View source ↗
  3. 2y ago

    Fill CSS moves into its own cascade layer

    The fill layout system's CSS is now scoped to a named htmltools cascade layer, deliberately lowering its precedence so app authors' own styles win. It is the third consecutive release walking back how forcefully fill styling is applied.

    View source ↗
  4. 2y ago

    save_html() becomes generic; css() passes CSS variables through

    Two real additions: save_html() becomes an S3 generic so classes can control how they serialize to a file, and css() leaves custom properties untouched, making CSS variables settable inline. Fill items also stop forcing full width, continuing the correction series.

    View source ↗
  5. 2y ago

    tagQuery() no longer errors traversing NULL on r-devel

    A single compatibility fix for an r-devel behavior change in tagQuery() traversal. Upkeep, not direction.

    View source ↗
  6. 3y ago

    Fillable containers stop forcing overflow, respect intrinsic size

    The first correction in the fill series: fillable containers no longer set overflow automatically, and non-fill items inside them respect their intrinsic size instead of stretching. htmlDependency() objects also render properly inside knitr chunks now instead of printing their structure.

    View source ↗