Skill学习指南🧑‍💻

JavaScript frameworks are an essential part of modern front-end web development, providing developers with tried and tested tools for building scalable, interactive web applications. Many modern companies use frameworks as a standard part of their tooling, so many front-end development jobs now require framework experience. This set of articles provides a comfortable starting point to help you begin learning frameworks.

The HTML element defines a group of columns within a table.

Now that we are comfortable with adding simple images to a webpage, the next step is to start adding video and audio players to your HTML documents! In this article we'll look at doing just that with the and elements; we'll then finish off by looking at how to add captions/subtitles to your videos.

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The HTML element defines one or more columns in a column group represented by its parent element. The element is only valid as a child of a element that has no span attribute defined.

This article walks through creating an extension for Firefox, from start to finish. The extension adds a red border to any pages loaded from mozilla.org or any of its subdomains.

The aim of this skill test is to help you assess whether you understand how to mark up text in HTML to give it structure and meaning.

Structuring a page of content ready for laying it out using CSS is a very important skill to master, so in this challenge you'll be tested on your ability to think about how a page might end up looking, and choose appropriate structural semantics to build a layout on top of.

The aim of this skill test is to help you assess whether you understand how flexbox and flex items behave. Below are four sets of design problems you can solve using flexbox. Your task is to fix the problems.