How to set the font family of "head" and the font size of paragraph with qtextdocument

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PDF

QT

HTML5

QT-Creator

Hi,

I am using QTextDocument to write html code and convert it to pdf file

code as below:

QPrinter html_printer(QPrinter::ScreenResolution);
html_printer.setPageSize(QPrinter::A4);
html_printer.setOutputFormat(QPrinter::PdfFormat);

html_printer.setOutputFileName(_file_path);

QString q_h5 = "<....>"    
QTextDocument text_document;    
text_document.setHtml(q_h5);    
html_printer.newPage();    
text_document.print(&html_printer);
text_document.end();

I found that it's impossible to set the font size and family to some paragraph.

What I have tried:

I have tried

q_h5 = "<p style=\"color:red;font-size:16px;\">aaaaaaaabbbbbb</p>"
     
q_h5 = "<font size =\"6\">aaaaaaaabbbbbbb"
     
q_h5 = "<p style=\"font-family:verdana;font-size:200%;color:green\">"

only color can be changed ,font size and family can't take effect.