Javasript: InnerHtml cannot read tag on mobile

Hi guys, i have an issue

I have HTML like this: 


i use java script inner html: 

var Test1= document.getElementById($parameters.Id);
   Test1.innerHTML = $parameters.Content;

but when i see the result on  mobile, Welcome text only bold.

any idea?

If I try on Web, the result bold and italic

Hi Jonatan,

"strong" and "em" are tags that typically cause the font-weight to increase and the font-style to be set to "italic", respectively, but this is browser dependent, and can be controlled by CSS.