There are different types of encoding depending on the context. ![]() It will be a primary defense against Cross-Site Scripting attacks. This is a major concern for security because embedded-JavaScript needs HTML tags to function. Web developers output a lot of dynamic data to HTML, so HTML encoding happens routinely. This will ensure that the content does not interfere with the structure of the HTML. "transformed") before being used anywhere in HTML. This is a common security vulnerability that hackers like to exploit.Īll dynamic values should be encoded (i.e. Using them accidentally could open a new tag or close an existing tag when it is not intended and break the entire page structure.Īllowing these characters in dynamic data also opens up the possibility that additional tags-including form elements and JavaScript-could be inserted in the HTML of the page. ![]() The are the most problematic characters because they indicate the start and end of tags. HTML would read the title value as "Movie: ". Here is what the resulting HTML would look like. ![]() In the example above, the " is a problem for the title attribute but not for the content of the paragraph. For example, it is not a problem to use " inside a paragraph of text, but it is a problem to use it inside an HTML attribute name. These characters do not have special meanings in all parts of HTML. ![]() There are a few characters which have special meanings in HTML and should be used with caution.
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