fnSetDefaultFont = function() {
			sDefaultFont = [
				parseFloat(ThemeParameters.get({ name: "sapMFontMediumSize" }) || "0.875rem") * fBaseFontSize + "px",
				ThemeParameters.get({ name: "sapUiFontFamily" }) || "Arial"
			].join(" ");
			return sDefaultFont;
		}
Measures the given text width in a canvas and returns the value in rem.

@param {string} sText The text to be measured
@param {string} [sFont] The font. When not given, uses theme parameters: sapMFontMediumSize and sapUiFontFamily.
@returns {float} The text width converted to rem
@private