VisualForce uses XML as the syntax to create front end design pages and uses APEX as the backend for implementing business logic. If you want to embed the whole developer platform, you are probably out of luck. The cost to SalesForce is an inclusion of a small html page with a small bit of JavaScript that in itself alters the iFrame for you. It contains tags and controllers where tags are also called as Components. Good news - there is a relatively easy fix for this that uses just a little bit of JavaScript. VisualForce is the Markup Language (Tag-based language) similar to HTML and XML, developed by. This can cause issues with Google Analytics and first touch reporting. The first step to embedding content in Salesforce is to create a new Visualforce page. It does require some changes to authentication in the iframed web app but they are relatively simple (10 lines or so of Python). When you place a Account Engagement form on a webpage using an iframe, the parent page's URL parameters are not automatically passed to the iframe. Overall, Canvas is cleaner than using a raw iframe and should simplify development. On authentication options: the Canvas Signed Request authentication is recommended and easy, but note that it doesn't give you a refresh token for OAuth2 - so if you need to do continuing background processing based on the user's authentication, you should use the Canvas OAuth2 authentication instead, which does give you a refresh token. There is no solution to ensure that the site always displays content in an iframe, as this is enforced by browsers based on headers If you own the site which you want to add via iframe, you can send the headers to indicate that your site might be added by others, or add or in crossdomain.xml.
You can also use the new Events feature within Canvas to send messages to the framing Salesforce page. It also enables the iframed web app to call Salesforce APIs based on that authentication, either via JavaScript or by your backend web app (Python, Java, etc) using the credentials from the Canvas framework. On the other hand, Lightning Components are not loaded in iframes but instead rendered on the main page.
can we communicate between a Visualforce iframe and a Lightning Component. A more recent approach, now GA, is Canvas - this is iframe-based with additional security and features, including passing context such as Salesforce fields into the iframe. Selection from Learning Salesforce Lightning Application Development Book.
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