All three UI patterns are commonly found in design systems, with many lines of JavaScript to implement custom styling, presentation, layout, interaction, or accessibility patterns.

Output: The results of executing the CSS, HTML, and JavaScript entered into the sections of the page. Figure A shows jsFiddle loaded in Internet Explorer 9 with empty code panes.

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Being able to work comfortably on Web-related code elements -- HTML, CSS, and JavaScript -- has become an increasingly important skill for all kinds of software development projects. Web apps, ...