This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
channelWidth property value indicates the channel width of the ranges of frequency, in MHz.
Usually, the value is one of:
0.1 (default) or
When a frequency is assigned to the radio, it is rounded to the closest frequency given the
channelWidth. For example, if 100Mz is a valid frequency and the channelWidth is 0.2, 100.2, 99.8 are also valid frequencies, but 100.15 will be rounded to 100.2.
var width = instanceOfFMRadio.channelWidth
Return a boolean.
Not part of any specification.