Ace Editor Syntax Validation Checking
When enabled, the Ace Editor Syntax Validation Checking feature provides you with visual indicators regarding the integrity of your code. Some of the notices are simple suggestions and you'll get used to ignoring a lot of those as they may or may not be relevant to your specific case of coding, but you'll also be informed with potentially "site breaking" snippets are in place. Taking things a step further, when the latter kind of bad code is present the Themer Pro editor will detect such code and prevent the "Save Changes" from completing, suggesting that you check your code and fix the error-causing snippet. But of course if all this is too much or distracting you can easily disable it through your Themer Pro settings page.