Baseline Tags
This section defines the standard TrueType Open baseline tags that Microsoft supports. A registered baseline tag has a specific meaning and conveys information to font users about a baseline's use. For example, the "romn" baseline tag is commonly used to identify the baseline for Latin text layout. For compatibility and ease of use, Microsoft encourages font developers to use registered baseline tags.
This version of the Tag Registry identifies the baselines that Microsoft has implemented to date. All tags are 4-byte character strings composed of a limited set of ASCII characters in the 0x20-0x7E range. Baseline tags consist of four lowercase letters.
| Baseline Tag | Baseline |
| "ideo" | Ideographic |
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| "hang" | Indic hanging |
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| "math" | Mathematical (centered) |
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| "romn" | Roman |
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