ABSTRACT
This chapter provides useful techniques for improving frontend optimization and shares the relationship between the HTML with CSS and JS. Web designers tend to create CSS Stylesheet after the main HTML skeleton of a web page has been created. As a result, CSS components can be placed at the bottom of the document. CDNs can also improve server response times by pre-pooling connections and keeping them open across sessions. A CDN by itself does not reduce the number of requests, but pre-pooling improves performance by eliminating the latency associated with closing and reopening TCP connections. Web Messaging is mainly used to share data by separating the browser context without using the DOM and overcomes the problems in cross-domain communication across different domains, protocols, or ports. Web Messaging is mainly used to share data by separating the browser context without using the DOM and overcomes the problems in cross-domain communication across different domains, protocols, or ports.
