The HTML output includes the parameter estimates from PROC REG, the parameter estimates from PROC GLM, and a report of the data set that ODS created from each set of parameter estimates.
The table of contents identifies output objects by their labels. The label for ParameterEstimates in PROC REG is Parameter Estimates. The corresponding label in PROC GLM is Solution. Notice how the column widths in the HTML output are automatically adjusted to fit the data. Compare this layout to the layout of the columns in the listing output.