Yes, it IS possible to have HTML emails with conditional attributes.

Following is a sample of an HTML Document Template used in an email notification.

Note this is using Build 1900.

Game date: <<GameAssignments.TeamTextSC>> - <<GameAssignments.EventDateSC@EEEE, MMM d, yyyy - h:mm a>>
 
<<IF GameAssignments.GameOverSC='Yes' AND GameAssignments.GameTypeSC='Dual' THEN SHOW SECTION_START>>Result: <<GameAssignments.TeamTextSC>> --> LW: <<GameAssignments.Game.OurScore>> <<GameAssignments.OpponentSC>>: <<GameAssignments.Game.TheirScore>>
 
Win/Loss: <<GameAssignments.Game.WinLoss>><<SECTION_END>>
 
<<IF GameAssignments.GameOverSC='Yes' AND GameAssignments.GameTypeSC='Invitational' AND (GameAssignments.Score_Inv_Place<>'Postponed' OR GameAssignments.Score_Inv_Place<>'Cancelled') THEN SHOW SECTION_START>>Invitational Place: <<GameAssignments.Score_Inv_Place>><<SECTION_END>>
 
<<IF (GameAssignments.Score_Inv_Place='Postponed' OR GameAssignments.Score_Inv_Place='Cancelled') THEN SHOW SECTION_START>>Postponed / Cancelled: <<GameAssignments.Score_Inv_Place>><<SECTION_END>>
 
<<IF (GameAssignments.SportSC='Baseball' OR GameAssignments.SportSC='Football') THEN SHOW SECTION_START>>Show Game Cast link?: <<GameAssignments.GameCastLinkShow>>
 
Game Cast link: <<GameAssignments.GameCastLink>><<SECTION_END>>
 
Abstract: <<GameAssignments.Game.Abstract>>
 
Score input by: <<LoggedInSystemUser.Name>> on <<CURRENT_TIMESTAMP@EEEE, MMM d, yyyy - h:mm a>>
 
Update link: <a href="<<GameAssignments.Edit_Game_URL>>">Edit this game</a>
 
Update link MOBILE: <a href="<<GameAssignments.Edit_Game_URL_MOBILE>>">Edit this game on phone</a>
 
Tweet edit link: <a href="<<GameAssignments.Edit_Tweet_URL>>">Tweet this game</a>
 
Schedule / Results Page: <a href="<<GameAssignments.Team_ScheduleSC>>"><<GameAssignments.TeamTextSC>></a>
 
Assignments:
 
Score / Abstract: <<GameAssignments.Assigned_ScoreAbstracts>>
 
Article: <<GameAssignments.Assigned_Articles>>
 
Photos: <<GameAssignments.Assigned_Photographers>>
 
== END ==