This question already has an answer here:
I've seen these types of instances occur quite often, and I'm curious to why (even without a filter) they won't execute... as the code is right there. Every occurrence of this I've noticed that when you inspect in any developer tool the tags aren't formatted; so in a visual perspective, just gray text. I know it's a vague question with not much content/context, but in any sense how is a, seemingly, unfiltered place of input like this, not exploitable and rendered without a XSS issue?
Edit: I used Chrome (with XSS protection disabled), Firefox, and Internet Explorer (there's a warning message when it filter something it believes is cross site scripting). This obviously ended with no results or explanation.
This is the element example I gave when you follow it.