Is it possible to draw a Bézier curve with variable width in SVG?

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I wrote a small library to draw signatures in HTML apps which uses Bézier curves with variable width (based on drawing speed) to simulate hand writing effect: http://ift.tt/18hPUCp.

Is it possible to draw such curve, i.e. Bézier curve with different width at its beginning and its end in SVG?

Is it possible to draw a Bézier curve with variable width in SVG?