Make sure that you have the most current version of your VRML browser and check its documentation to make sure that it supports VRML97.
You can find the complete VRML97 specification at http://www.web3d.org/x3d/vrml/index.html. This document describes the entire VRML97 language and provides technical details on the behavior of exported VRML97 worlds.
The VRML97 exporter supports the following:
All VRML97 light types: direct, omni, and spot.
Free and targeted cameras.
Sphere, cone, box, and cylinder primitive objects. These objects export as VRML97 primitive objects. This helps reduce the size of VRML97 files.
All position, rotation, and scale animation on objects, as well as animated hierarchies, inverse kinematics, and all controller types. Select Coordinate Interpolators in the Export dialog to export animated meshes, such as an animated Bend modifier or character studio Physique animations.