In The Unicode Standard, Glagolitic script implementation is discussed in  Chapter 7 Europe-I.

The Glagolitic script was encoded in The Unicode Standard version 4.1. The script is now encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode chart
Glagolitic 2C00..2C5F 4.1  U2C00.pdf

Subsequent to version 4.1, the following characters have been added to the script:

CharactersUnicode VersionDocumentation
1E000..1E006 9.0  WG2 N4608,  L2/14-087
1E008..1E018 9.0  WG2 N4608,  L2/14-087
1E01B..1E021 9.0  WG2 N4608,  L2/14-087
1E023..1E024 9.0  WG2 N4608,  L2/14-087
1E026..1E02A 9.0  WG2 N4608,  L2/14-087

Documentation refers to  ISO Working Group and Unicode proposals

A number of proposals for its inclusion have been submitted to the Unicode Technical Committee and WG2:

1992-10-29 Glagolitic — Joe Becker ( Unicode Technical Report #3 R2)

1996-12-15 Glagolitic coded character set for bibliographic information interchange ( L2/98-190)

1997-12-08 Proposal to encode Glagolitic in ISO/IEC 10646 — Michael Everson ( WG2 N1659.htm, L2/98-023 (not online))

1998-11-24 Revised proposal for encoding the Glagolitic script in the UCS — Michael Everson ( WG2 N1931,  L2/99-012)

2002-12-04 Revised proposal for encoding the Glagolitic script in the UCS — Michael Everson, Ralph Cleminson ( WG2 N2555,  L2/02-448)

2003-09-04 Final proposal for encoding the Glagolitic script in the UCS — Michael Everson, Ralph Cleminson ( WG2 N2610,  L2/03-282)

2004-01-16 Letter about Glagolitic encoding — Ralph Cleminson ( L2/04-052)

2004-01-29 Comments on 2619R Final Glagolitic proposal — Deborah Anderson ( L2/04-051)

2004-05-29 Proposal to add COMBINING GLAGOLITIC SUSPENSION MARK to the BMP of the UCS — Michael Everson ( WG2 N2763,  L2/04-171)

2013-09-23 Proposal to Encode a Slavonic Punctuation Mark in Unicode — Aleksandr Andreev, Yuri Shardt, Nikita Simmons ( L2/13-140)

2013-11-01 Expert Feedback on L2/13-140 SLAVONIC PARAGRAPHOS — Stephen Emmel, Jost Gippert ( L2/13-212)

2014-02-04 Proposal to Encode a Slavonic Punctuation Mark in Unicode — Aleksandr Andreev, Yuri Shardt, Nikita Simmons ( WG2 N4534,  L2/13-238)

2014-04-27 Expert Feedback on L2/14-087 Proposal to Encode Additional Glagolitic Characters — Ralph Cleminson, David Birnbaum ( L2/14-103)

2014-07-21 Additional Expert Feedback on L2/14-087 Proposal to Encode Additional Glagolitic Characters — Ralph Cleminson, David Birnbaum ( L2/14-165)

2014-08-20 Proposal to Encode Additional Glagolitic Characters in Unicode — Aleksandr Andreev, Heinz Miklas, Yuri Shardt ( WG2 N4608,  L2/14-087)

2014-10-21 WG2 Consent Docket — Ken Whistler, Deborah Anderson ( L2/14-259)

2015-07-20 Suggested Responses to Suggestions re Cyrillic in L2/15-014 — Ken Whistler ( L2/15-182)