zarr-python
Zarr's package split keeps producing standalone tools: a server, now a lazy indexer.
Comparison · DevOps
htmltools vs xml2
A side-by-side editorial comparison of htmltools and xml2 — release velocity, themes, recent moves, and the top alternatives to consider.
Shared themes:maintenance
htmltools vs xml2: at a glance
What is htmltools?
htmltools spends three releases walking back its own fill-layout opinions
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.
What is xml2?
xml2 relicensed to MIT, then moved its hot accessors from S3 into C
xml2 is the libxml2 binding under most R HTML and XML work, including rvest. Its release cadence is set by libxml2 versions and R CMD check, but two of the last six matter on their own: the 1.3.3 MIT relicense and the 1.3.6 dispatch rewrite that pushed the common accessors into C and dropped three dependencies.
htmltools vs xml2: editorial side-by-side
htmltools
0.0DEVOPS
htmltools spends three releases walking back its own fill-layout opinions
◆ 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.
xml2
0.0DEVOPS
xml2 relicensed to MIT, then moved its hot accessors from S3 into C
◆ Current state
xml2 is the libxml2 binding under most R HTML and XML work, including rvest. Its release cadence is set by libxml2 versions and R CMD check, but two of the last six matter on their own: the 1.3.3 MIT relicense and the 1.3.6 dispatch rewrite that pushed the common accessors into C and dropped three dependencies.
◆ Where it's heading
This is infrastructure maintenance in the strict sense - most releases exist because the toolchain moved, not because the package did. Where the maintainers do choose the work, it goes to performance and dependency reduction rather than new API, and the surface has been essentially stable since 1.3.0.
◆ Prediction
Expect the next releases to track libxml2 compatibility and R-devel format-string warnings; new API is unlikely beyond occasional XPath accessors in the style of xml_find_int().
Alternatives to htmltools and xml2
Other DevOps products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either htmltools or xml2.
ellipsis
ellipsis' checks live in rlang now; the package is a compatibility shim.
clock
clock is turning calendar conventions lubridate hard-coded into parameterized types.
httpuv
httpuv ships almost nothing, which is what you want from the web server under Shiny
promises
promises drops R6 for plain environments and wires async work into OpenTelemetry
withr
withr rebuilt defer() on base R's own on.exit(), and got much faster for it
See all htmltools alternatives → · See all xml2 alternatives →
Recent activity from htmltools and xml2
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 8mo agohtmltoolsTest fix for testthat 3.3.0
- 8mo agohtmltoolscapturePlot() examples run only interactively
- 2y agohtmltoolsFill CSS moves into its own cascade layer
- 2y agoxml2Accessors dispatch in C; glue, withr and lifecycle dropped
- 2y agohtmltoolssave_html() becomes generic; css() passes CSS variables through
- 2y agohtmltoolstagQuery() no longer errors traversing NULL on r-devel
- 3y agohtmltoolsFillable containers stop forcing overflow, respect intrinsic size
- 3y agoxml2Small xml_find_all() speedup and check fixes
- 3y agoxml2R CMD check fixes and a Windows libxml2 bump
- 4y agoxml2Relicensed to MIT, with Hadley Wickham back as maintainer ⚡
- 6y agoxml2Rejects multi-element strings; fixes a raw-input regression
- 6y agoxml2Restores reading HTML with non-ASCII encodings
Frequently asked questions
What is the difference between htmltools and xml2?
Both compete on the same themes — maintenance — within DevOps. htmltools and xml2 are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is htmltools better than xml2?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. htmltools and xml2 are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other DevOps products to evaluate alongside.
What are the best alternatives to htmltools?
Top htmltools alternatives in DevOps are ranked by recent ship velocity. Browse the "htmltools alternatives" section above for the current picks, or visit /alternatives/htmltools for the full list with editorial commentary on each.
What are the best alternatives to xml2?
Top xml2 alternatives in DevOps are ranked by recent ship velocity. Browse the "xml2 alternatives" section above for the current picks, or visit /alternatives/xml2 for the full list with editorial commentary on each.