See CMoS 14.104 for website tips.
Try to include as much of the following as you can: authors (often unavailable), title of specific web page (if cited); title of overall website; owner or sponsor of website (if present); and publication date, last revised date, or access date.
F: "Liberasti enim me apressura," Cantus: A Database for Latin Ecclesiastical Chant, accessed January 23, 2015, http://cantusdatabase.org/id/001235za.
B: Cantus: A Database for Latin Ecclesiastical Chant. "Liberasti enim me apressura." Accessed January 23, 2015. http://cantusdatabase.org/id/001235za.
More website footnote examples:
F: "Strategy 2030: Moving Jacobs Into the Future," Jacobs School of Music, Indiana University Bloomington, accessed August 1, 2025, https://music.indiana.edu/about/strategic-planning/index.html.
F: "Music Teacher Profession Initiative," National Association for Music Education, accessed August 5, 2025, https://nafme.org/advocacy/music-teacher-profession-initiative/.
F: "Che t'ho fatt'io," IPA Source, accessed July 31, 2025, https://www.ipasource.com/product/che-tho-fattio/.