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CodePen is an online community for testing and showcasing user-created HTML, CSS and JavaScript code snippets. It functions as an online code editor and open-source learning environment, where developers can create code snippets, called "pens," and test them.
W3Schools also publishes free HTML templates. It is run by Refsnes Data in Norway. [6] It has an online text editor called TryIt Editor, and readers can edit examples and run the code in a test environment. The website also offers free hosting for small static websites.
JSFiddle is an online IDE which is designed to allow users to edit and run HTML, JavaScript, and CSS code on a single page. [3] Its interface is minimalist and split into four main frames, which correspond to editable HTML, JavaScript and CSS fields and a result field which displays the user's project after it is run.
Single page version [55] (allows global search of contents) Chapters §5 Microdata [56] §9 Communication [57] §10 Web workers [58] §11 Web storage [59] Global attributes : [60] class, id: [61] autocapitalize, enterkeyhint, inputmode, is, itemid, itemprop, itemref, itemscope, itemtype, nonce: Chapter Elements of HTML §4.13 Custom elements ...
You might also display a warning in the HTML content if the cookie is set, reminding of its existence and impact, and giving a link to remove it should the user change their mind. The performance cost of all of what I just described should be completely negligible in comparison with the performance cost of doing HTTPS in the first place.
As a document format, similar to HTML documents, SVG can host scripts or CSS. This is an issue when an attacker can upload a SVG file to a website, such as a profile picture, and the file is treated as a normal picture but contains malicious content. [ 79 ]