Scope of Support for Website Chat button

Salesforce Chat (formerly Live Agent), Embedded Web Service (formerly Snap-Ins) and Omni-Channel chat capabilities can span many different environments. The scope of Salesforce Support is to troubleshoot issues that are related to the setup of these products.

If Chat is not working within Salesforce via a Visualforce Page, Community, or Basic HTML Doc (only including Chat Button and Deployment Code or standard Embedded Web Service code snippet that doesn't have custom components configured), Salesforce Support can help troubleshoot issues.  

It is out of the scope of Salesforce Support when issues arise from an external website but the previously mentioned items are working correctly. 

For customer facing issues on external websites, we generally recommend placing the Embedded Web Service code in an iframe to isolate the component from framework libraries or other Javascript/CSS that may be causing problems. More information can be found in this article "Use an Iframe to Protect Embedded Service Chat on Your Website".