Does having tag hurt SEO nested in the heading tags or any paragraph tags?

Have 3 questions about this:

If I do

<h1>H<span style="font-size: 12px;">ello</span> W<span style="font-size: 12px;">orld</span></h1> 
  1. Will search engines read it as “Hello World”?
  2. Will this hurt SEO?

I am not doing any JS or anything else. I just want the other letters smaller. I know I should find a font called “Small Caps” – but for this font that I have does not exist.

  1. What would you recommend in this case the best approach?