this is not showing anything on my screen (just a blank canvas)

(It works on Chrome and Safari, but not Firefox)

Thanks Fil. It looks like the textMetrics I use with an offscreen Canvas does not provide the correct text height in Firefox. Will investigate further to see if there is a less browser-dependent way of doing this.

Solved: r.textMetrics uses Canvas.measureText() to find rendered font sizes. It appears measureText() does not report fontBoundingBoxAscent/Descent in Firefox. Changing it to actualBoundingBoxAscent/Descent seems to solve the problem.

👌🏼

The top line of label text is partially clipped for me in chrome.

You may want to pin the version to "@1.1" to avoid problems caused to future changes.

Yes, thanks - have edited now to reflect this good practice.