function HTMLCov(runner) {
  var jade = require('jade');
  var file = join(__dirname, '/templates/coverage.jade');
  var str = readFileSync(file, 'utf8');
  var fn = jade.compile(str, { filename: file });
  var self = this;

  JSONCov.call(this, runner, false);

  runner.on('end', function() {
    process.stdout.write(fn({
      cov: self.cov,
      coverageClass: coverageClass
    }));
  });
}
Initialize a new `JsCoverage` reporter.

@api public
@param {Runner} runner