lineHeight() {
		if (this.ancestor instanceof Text) {
			return this.ancestor.fontSize * this.ancestor.lineHeight;
		} else {
			// it's a BitmapText
			return (
				this.ancestor.fontData.capHeight *
				this.ancestor.lineHeight *
				this.ancestor.fontScale.y
			);
		}
	}
Returns the height of a segment of inline text in CSS pixels.
@returns {number} the height of a segment of inline text in CSS pixels.