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For UAs that allow JavaScript, an additional option is available through the navigator.userAgentData JavaScript API. This API enables JavaScript to retrieve the same information as provided by the Client Hints headers. [1] The API separates the data it provides into two types: low-entropy data and high-entropy data. Low-entropy data corresponds ...
An optional base64 extension base64, separated from the preceding part by a semicolon. When present, this indicates that the data content of the URI is binary data , encoded in ASCII format using the Base64 scheme for binary-to-text encoding .
On Microsoft Windows systems, the normal colon (:) after a device letter has sometimes been replaced by a vertical bar (|) in file URLs. This reflected the original URL syntax, which made the colon a reserved character in a path part. Since Internet Explorer 4, file URIs have been standardized on Windows, and should follow the following scheme ...
These are typically built into browsers, in their DevTools window. Debuggers allow you to step debug (go through your JavaScript code line-by-line, hover over variables to see their values, etc.) Firefox - use Tools → JavaScript Console which shows all JavaScript and CSS errors. Chrome and Edge - use Tools → Developer Tools.
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The procedure for adding images to articles is the same, regardless of whether the image was uploaded to Commons or directly to English Wikipedia. To make your uploaded file appear in an article, you need to insert it: edit the article and add the syntax [[File:Image name|thumb|Caption]] where you want the file to appear.
Firefox also suffered a similar security issue (by combining view-source and JavaScript URIs [5]), but still supported it in Firefox 1.5 [6] after being fixed. In 2009, a new discovered bug was fixed in Firefox 3.0.9. [7]
Writing a Greasemonkey script is similar to writing JavaScript for a web page, with some additional allowances such as cross-site XMLHttpRequests. Compared to writing a full-fledged Firefox extension, user scripting is a very modest step up in complexity from basic web programming.