Dom_html.textMetrics
https://developer.mozilla.org/docs/Web/API/TextMetrics/actualBoundingBoxAscent
https://developer.mozilla.org/docs/Web/API/TextMetrics/actualBoundingBoxDescent
https://developer.mozilla.org/docs/Web/API/TextMetrics/actualBoundingBoxLeft
https://developer.mozilla.org/docs/Web/API/TextMetrics/actualBoundingBoxRight
https://developer.mozilla.org/docs/Web/API/TextMetrics/alphabeticBaseline
https://developer.mozilla.org/docs/Web/API/TextMetrics/fontBoundingBoxAscent
https://developer.mozilla.org/docs/Web/API/TextMetrics/fontBoundingBoxDescent
https://developer.mozilla.org/docs/Web/API/TextMetrics/hangingBaseline
https://developer.mozilla.org/docs/Web/API/TextMetrics/ideographicBaseline