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Also potentially dangerous attributes such as the onclick attribute are removed in order to prevent malicious code from being injected. Sanitization is typically performed by using either a whitelist or a blacklist approach. Leaving a safe HTML element off a whitelist is not so serious; it simply means that that feature will not be included ...
HTML attributes are special words used inside the opening tag to control the element's behaviour. It is a piece of markup language used to adjust the behavior or display of an HTML element.HTML attributes are a modifier of a HTML element type.
The concept of "unobtrusiveness" in relation to client-side JavaScript was coined in 2002 by Stuart Langridge [7] in the article "Unobtrusive DHTML, and the power of unordered lists". [8] In the article Langridge argued for a way to keep all JavaScript code, including event handlers, outside of the HTML when using dynamic HTML (DHTML). [7]
However, ASP.NET needs to hide the fact that in HTML there is no way to submit a form from a hyperlink. It does this by generating a few lines of JavaScript and attaching an onclick handler to the hyperlink. However, if the end user has JavaScript disabled, the ASP.NET application malfunctions.
As the JavaScript code was also processing user input and rendering it in the web page content, a new sub-class of reflected XSS attacks started to appear that was called DOM-based cross-site scripting. In a DOM-based XSS attack, the malicious data does not touch the web server.
JavaScript can interact with the page via Document Object Model (DOM), to query page state and modify it. Even though a web page can be dynamic on the client-side, it can still be hosted on a static hosting service such as GitHub Pages or Amazon S3 as long as there is not any server-side code included.
The words that follow identify what is being linked; this is the only part of the code that is ordinarily visible on the screen when the page is rendered, but when the cursor hovers over the link, many browsers display the target URL somewhere on the screen, such as in the lower left-hand corner.
For example, a website could serve a JavaScript file with code that sets a unique identifier for the user (for example, var userId = 3243242;). After the user's initial visit, every time the user accesses the page, this file will be loaded from the cache instead of downloaded from the server.