To make matters worse, the error event handler that was built into the Spreedly library wasn't logging any useful information. However, when loading and running our application in its normal context in the browser, everything worked fine and we could not reproduce the bug outside of Cypress despite our best efforts. The gist of this bug was that the Spreedly-managed credit card number and CVV input fields were failing to render and display in Cypress and as a consequence, were causing cascading failures in our tests. Little did I know of the journey I would go on when taking on bug ticket #5629. This is where we first encountered the bug. ![]() When Cypress Test Runner executes our tests, it loads our application into its own iframe and context. Now that's a lot of iframes, but you may be asking yourself "Can we go deeper?" The answer is a resounding yes! We also introduce yet another iframe during our end-to-end testing with Cypress. Spreedly injects a parent iframe within our own form's iframe, which then subsequently renders two children iframes for each of the Spreedly-managed fields. To make this easier to conceptualize, let's examine what this form might actually look like and where boundaries of the various iframes are. We were providing our own iframe to clients which then, in turn, had multiple Spreedly iframes embedded within that. Now, you may have already noticed, but we were working in an iframe inception. In addition, the library initializes and embeds two Spreedly-managed input fields, one for the user's credit card number and the other for the CVV, in a series of iframes. As part of Spreedly's offering, a JavaScript library is available that provides functionality to tokenize and store payment methods such as bank accounts and credit cards. As part of our efforts to create a secure experience for our users, we were using a third-party payment processor/gateway service called Spreedly. I was working on a client project where we were building a payment/checkout form to be embedded across a suite of UI applications as an iframe. I'm hoping that you may find some value or learn something new in this recount of the steps I took, tools I used, and misdirections I encountered in my clash with this bug. It took all of the debugging techniques I have learned as a developer (and then some!) to solve and fix it. Recently, I found myself tackling one of the most difficult, bewildering, and intricate bugs that I have ever faced thus far in my career. Being able to effectively discover, track down, and resolve bugs is one of the most important skills in our toolboxes. This can lead to degraded user experiences, application downtime, and potentially a loss of revenue for our businesses. Despite our best intentions, careful code craftsmanship, and thorough testing, these software defects will still discreetly and insidiously make their way into our applications. When the user clicks a button, we want to inject some styles into the document of the iframe.As software engineers, a large portion of our time is spent researching, reproducing, and fixing bugs. Now, lets say that your host app is at and the iframe loads a document from. Origin of a document is a combination of its protocol (http, https), domain & port. This is done to prevent embedded documents access to your sites cookies, localStorage data etc. ![]() ![]() Naturally, this also means that one has to be very careful about security.Īll Browsers implement a Cross-Origin Access Restriction to prevent the host document from accessing the iframe document, unless they have the same origin. While iframe is a very powerful tool, it essentially means that you are running some arbitary code, loaded from a remote server (which you may or may not control) on your app and exposing your users to it. This post will breifly explain the Cross-Origin access problem that is faced when accesing an iframe document and how you can setup your development environment to overcome this problem. While embedding an iframe is pretty straightforward, customising the document inside the iframe is not that simple. Sites like YouTube and Google Maps use iframes to embed thier content in your website. As most of you would know, the iframe or inline frame element allows you to embed one HTML page into another.
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