"params" properties does not work

"params" properties does not work

why "params" properties does not work ??

<iframe height='500px'width='100%'name='reportEmbed-Copy_ofbase_de_donn_e_produit'frameborder='10'scrolling='auto' allowTransparency ='true'elName='zc-component'params='zc_AddRec=false&zc_HdrFontClr=Blue&zc_HdrFontSize=20'src='https://creator.zoho.com/pere...xxxxxx></iframe>

any idea ?
Cheers