A shape which is located on the slide has a paragraph and this paragraph has A.Run instance which property RunProperties.FontSize is null.
This instance also contains text. How can I get his font size? Maybe if <g class="gr_ gr_66 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="66" id="66">FontSize</g> is null then this instance uses some default <g class="gr_ gr_41 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="41" id="41">FontSize</g>, but then where store this value?