Editing OpenType (section)

===Baseline tags===
Baseline tags have a specific meaning when used in the horizontal writing direction (used in the 'BASE' table's HorizAxis table), vertical writing direction (used in the 'BASE' table's VertAxis table), or both.
{|class="wikitable"
|+Baseline tags and axes in OpenType fonts
|-
! scope="col"| Baseline tag
! scope="col"| HorizAxis
! scope="col"| VertAxis
|-
! scope="row"| 'hang'
|horizontal line from which the syllabograms seem to hang in the [[Tibetan script]]	
|The same line in Tibetan vertical writing mode.
|-
! scope="row"| 'icfb' 	
|Ideographic character face bottom edge baseline.
|Ideographic character face left edge baseline.
|-
! scope="row"| 'icft' 	
|Ideographic character face top edge baseline.
|Ideographic character face right edge baseline.
|-
! scope="row"| 'ideo'
|Ideographic em-box bottom edge baseline.
|Ideographic em-box left edge baseline.
|-
! scope="row"| 'idtp'
|Ideographic em-box top edge baseline.
|Ideographic em-box right edge baseline.
|-
! scope="row"| 'math'
|The baseline about which mathematical characters are centered.
|The baseline about which mathematical characters are centered in vertical writing mode.
|-
! scope="row"| 'romn'
|The baseline used by simple alphabetic scripts such as Latin, Cyrillic and Greek. 
|The alphabetic baseline for characters rotated 90 degrees clockwise for vertical writing mode.
|}