修改HTML <a> Tag without href attribute Inside a Contenteditable Div

Question

I found when editing a <a> tag, the behavior is different when it has attribute href or not.

1. Adding character after <a> tag with href (the cursor was inside the <a> node), the added char will not be inside the <a> tag

   <a href="fakelink">tes</a>
   

   type 't' it will become

   <a href="fakelink">tes</a>"t"
   

2. Adding character after tag without href (the cursor was inside the node), the added char will be inside the tag

   <a>tes</a>
   

   type 't' it will become

   <a>test</a>
   

why is this?

Is it possible to make a span node behave like first case, I mean when you add character after that span node (the cursor was inside the span node), the new char is outside the span node?