Definition
Font Metrics API Level 1 defines FontMetrics
[Exposed=Window]
interface FontMetrics {
readonly attribute double width;
readonly attribute FrozenArray<double> advances;
readonly attribute double boundingBoxLeft;
readonly attribute double boundingBoxRight;
readonly attribute double height;
readonly attribute double emHeightAscent;
readonly attribute double emHeightDescent;
readonly attribute double boundingBoxAscent;
readonly attribute double boundingBoxDescent;
readonly attribute double fontBoundingBoxAscent;
readonly attribute double fontBoundingBoxDescent;
readonly attribute Baseline dominantBaseline;
readonly attribute FrozenArray<Baseline> baselines;
readonly attribute FrozenArray<Font> fonts;
};