The panner node is spatialized in relation to the AudioContext's AudioListener (defined by the AudioContext.listener attribute), which represents the position and orientation of the person listening to the audio.
The suspend() method of the AudioContext Interface suspends the progression of time in the audio context, temporarily halting audio hardware access and reducing CPU/battery usage in the process — this is useful if you want an application to power down the audio hardware when it will not be using an audio context for a while.