BibTeX Reference for “CSS Masking Module Level 1”

@TechReport{Birtles:21:CMM,
  author      = "Brian Birtles and Tab Atkins Jr. and Dirk Schulze",
  title       = "{CSS} Masking Module Level 1",
  month       = aug,
  note        = "https://www.w3.org/TR/2021/CRD-css-masking-1-20210805/",
  year        = "2021",
  bibsource   = "https://w2.syronex.com/jmr/w3c-biblio",
  type        = "Candidate Recommendation",
  institution = "W3C",
}