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David Baron
David Baron in 2017
Other namesL. David Baron[1]
Alma materHarvard University[2]
Occupationweb browser engines
Known forCSS, Gecko rendering engine

David Baron is an American computer scientist, web browser engineer, open web standards author, technology speaker,[3][4] and open source contributor. He has written and edits several CSS web standards specifications including CSS Color Module Level 3,[5] CSS Conditional Rules,[6] and several working drafts. He started working on Mozilla in 1998,[4] and was employed by Mozilla in 2003 to help develop and evolve the Gecko rendering engine, eventually as a Distinguished Engineer[7] in 2013.[8] He was Mozilla’s representative on the WHATWG Steering Group from 2017-2020.[9][10] He has served on the W3C Technical Architecture Group (TAG) continuously since being elected in 2015[11] and re-elected subsequently, most recently in 2020.[12][13] In 2021 he joined Google to work on Google Chrome.[14]

Notable inventions


Baron is the author and editor of several W3C web standards:

Baron was also a technical reviewer of the book "Transitions and Animations in CSS: Adding Motion with CSS".[20]


  1. ^ "Dbaron - Overview". GitHub.
  2. ^
  3. ^ "SXSW 2009: Full Event List".
  4. ^ a b "Fast CSS: How Browsers Lay Out Web Pages".
  5. ^ a b "CSS Color Module Level 3". June 19, 2018.
  6. ^ a b Baron, L. David (April 4, 2013). "CSS Conditional Rules Module Level 3".
  7. ^ "Chrome deploys deep-linking tech in latest browser build despite privacy concerns".
  8. ^ "Mozilla Distinguished Engineer: David Baron". 2013-03-11. Archived from the original on 2013-09-18. Retrieved 2020-08-23.
  9. ^ "The WHATWG Blog — Further working mode changes".
  10. ^ "Update SG representative for Mozilla. by dbaron · Pull Request #142 · whatwg/sg". GitHub.
  11. ^ "Statements about TAG nominees for 2015 Election".
  12. ^ "W3C Advisory Committee Elects Technical Architecture Group | W3C News". 13 January 2020.
  13. ^ "TAG members over time". Retrieved 2022-01-21.
  14. ^ "L. David Baron". Twitter. Retrieved 2021-03-01.
  15. ^ "README.txt - mozsearch".
  16. ^ "Firefox 5 beta arrives for desktop and Android". 2011-05-24. Retrieved 2020-08-23.
  17. ^ "CSS Animations Level 1".
  18. ^ "CSS Overflow Module Level 3".
  19. ^ "CSS Transitions".
  20. ^ Weyl, Estelle (April 14, 2016). Transitions and Animations in CSS: Adding Motion with CSS. "O'Reilly Media, Inc.". ISBN 9781491929834 – via Google Books.