I am not calling this the real solution and would not recommend doing that every time since it depends on your Web Component if the following makes sense. Depending on how you are going to use your Web Components, it is excellent that they do not reflect each others state. At first, we set the attribute to two, and then we access the property, which is still one.Įvery Web Component (or in this case HTML element) has a JavaScript state (the properties) and its DOM representation (the attributes). The same is true with the two last lines. It is simple we are setting the property of the input element, and not its attribute. However, with line 4, we are setting an input value, and after that, it is still null. Then we query its attribute at line 3, which is, obviously, null, since we did not set the value of the input. Let’s see what is exactly happening here.Īt line 1, we are creating a new element. I guess that some of you expected that output and others did not, especially if you do not have a web development background. But you still could have the problem, that the wrong version of your expected Web Component version is loaded. Last but not least, you can conditionally register a Web Component, by checking if another with the same name is registered or not using ().That sounds a bit impossible to achieve, but if you think of small, very specific Web Components, it may not be that hard to do so. You develop your Web Components in a way that they are backward compatible all the time within their lifetime.It could be that different libraries expect a specific version of a Web Component, which could break if a newer or older version is loaded. It may suggest to the host application which library to load, but it’s the host application’s decision which Web Components to load. In this case, a library can use Web Components but does not load the code itself. Libraries never load other custom Web Components, but the host application does.Be aware that this is quite uncommon for HTML tags and should only be used if there is no other way to solve it. Version your HTML tags – as long as you use semantic versioning, your v1 will never break any existing application using that version.I would highly recommend reading through the comments.Īdditionally, if you need to solve the problem right now, you can do several things: It is interesting what they are discussing and how to implement it. You can enable JavaScript/Java execution for sites you trust with a simple left-click on the NoScript status bar icon (look at the picture) or use the contextual menu for easier operation in popup status bar-less windows.The W3C is currently discussing a Scoped Custom Element Registry, which would define at what place in the DOM, which Custom Element Registry is used for registering HTML tags and where they are valid. NoScript also provides the most powerful anti-XSS and anti-Clickjacking protection available in a browser.Ī unique whitelist-based pre-emptive script blocking approach prevents exploiting security vulnerabilities (known and unknown yet!) with no functionality loss. NoScript is an Open Source add-on/extension that provides extra protection for Firefox, Chrome, Flock, Seamonkey, and other Mozilla or Chromium-based browsers.
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