Solution : https://service.sap.com/sap/support/notes/820706 (SAP Service marketplace login required)
Key words :
format field1=value1&field2=value2, =myform method=post action=, form post method, terms html control, sap html control, abap class cl_gui_html_viewer, cl_gui_html_viewer abap class, -column table query_table, =myform method=, class cl_gui_html_viewer
Related Notes :
| 853159 | ITS HTML Viewer: Error with SAPEVENT in HTML anchor |