In some implementations, a method for remediating issues on webpages through client-side fixes that are performed without modifying underlying webpage code includes receiving, at a remediation server system, a request for remediation code, the request for remediation code originating from a client computing device that has accessed a webpage that has a statement requiring the remediation code, the webpage being part of a website that is hosted by a third party server system, the request identifying the webpage that is requesting the remediation code. The method can further include identifying one or more specific remediations for remediating issues on the website; accessing one or more specific remediation code portions; and accessing a client-side remediation code engine. The method can further include transmitting the client-side remediation code engine and the one or more specific remediation code portions to the client computing device.