BibTeX Reference for “CSS Color Module Level 3”

@TechReport{0603326,
  author      = "Tantek \c{C}elik and David Baron and Chris Lilley",
  title       = "{CSS} Color Module Level 3",
  month       = jun,
  note        = "https://www.w3.org/TR/2018/REC-css-color-3-20180619/",
  year        = "2018",
  bibsource   = "https://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Recommendation",
  institution = "W3C",
}