This section is optional, purely for informative purposes, so if you want to, you can skip it. In this section, we shall understand what exactly was and why were they popular at a time: and why they lost that position, eventually finding themselves in the class of obsolete HTML elements. Modern-day code, as per the standard's recommendation, should NOT use and. With HTML5, however, both these elements got deprecated from the language. īack in time when was introduced with HTML4, we also got two other frame-related elements alongside it, namely and. That is, hyperlinks inside a document embedded inside an would open up inside that. So, for example, if you start off with the example page linked above, and then navigate to three pages in the embedded, you would have to go back three times after that in order to get to the original entry of the example page.īy default, hyperlinks in HTML are opened up in the very browsing context that owns them. This is because s share their session history with that of their top-level window. The back button will instead take you to the previous page inside the the top-level window would remain as it is. Now, once you make a couple of navigations, try going back by using the browser's back button.Īt this point, you might expect the back button to take you to the previous page in the top-level window but that's NOT what will happen. As you do so, you'll notice all the navigations happening inside the, not its parent window. go to the courses page, or maybe our blog page). In the link above, try navigating our landing page inside the (for e.g. It's just a simple loading up our landing page. The containing webpage where the element exists is called the embedding webpage.Īnd this is it for the basic terminology used while discussing about iframes. So in that sense, we have parent windows, child windows, and top-level windows.Īn embeds a webpage into an existing webpage often called the embedded page. Sometimes these terms are also referred to with the word 'window'. The top-level browsing context is one without any parent, hence the 'top-level', and it's almost always the main browser tab/window. Similarly, C is called the child browsing context of P. a tab/window can contain an, which itself denotes a new browsing context.Ī browsing context P that contains another browsing context C is called the parent browsing context of C. A simple exampleīecause a browsing context has a separate allocation of its resources, it's a good idea to keep s (which create browsing contexts) to a minimum in order to conserve the memory of the underlying machine.īrowsing contexts can contain browsing contexts within them. , however, still remains an integral component of many modern-day websites. and were deprecated in HTML5 due to certain usability and accessbility issues, which we'll discuss later on in this chapter. And that's where the blog leverages the element.Īnyways, moving on, was introduced under the larger idea of 'frames', as a way to embed documents within documents, in HTML4, along with its friends and. In this case, the blog can simply embed a third-party's web application, meant to read code and produce its output in situ. It would be too early to explain all that technical jaron at this stage.Īs a simple example of an, one that you would've probably already witnessed before, suppose a blog has to embed a code snippet along with a program that can run that code (sometimes on another server) and show the response/output live, something like Codepen or JSFiddle. The fact that certain things are easier with s will become much clearer to you once you become a complete developer, knowing how to develop custom video player, ad libraries, and interactive utility apps, using JavaScript and other web technologies.
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