Select an audio file and its technical properties are listed immediately after decoding. WAV files additionally show the bit depth and PCM format read from the header.
For compressed formats the tool divides the file size by the duration, which gives the true average bitrate but cannot distinguish constant from variable bitrate encoding. Container overhead and embedded artwork also nudge the figure slightly.
The Web Audio API always hands back 32-bit float samples regardless of the source, so the original bit depth is lost during decoding. For WAV the tool reads the RIFF header directly and reports the real stored bit depth and PCM format.
No, it reports technical properties rather than tag metadata. The focus is the information you need for editing and compatibility decisions: duration, channels, sample rate, size and encoding.