HTML files should have a .html extension (.htm is allowed).

CSS files should have a .css extension.

JavaScript files should have a .js extension.

Example: HTML

.mp4 .mp3 .html .php .3gp .apk

What is HTML Style Guide	HTML Style Guide
How to create Always Declare Document Type	HTML Style Guide
How to Use Lowercase Element Names	HTML Style Guide
How to Close All HTML Elements	HTML Style Guide
How to Use Lowercase Attribute Names	HTML Style Guide
How to create Always Quote Attribute Values	HTML Style Guide
How to create Always Specify alt, width, and height for Images	HTML Style Guide
How to create HTML Spaces and Equal Signs	HTML Style Guide
How to Avoid HTML Long Code Lines	HTML Style Guide
How to create HTML Blank Lines and Indentation	HTML Style Guide
How to create Never Skip the <title> Element	HTML Style Guide
What is Omitting <html> and <body>	HTML Style Guide
What is Omitting <head>	HTML Style Guide
How to Close Empty HTML Elements	HTML Style Guide
How to Add the lang Attribute	HTML Style Guide
What is Meta Data	HTML Style Guide
How to Set The Viewport	HTML Style Guide
How to set HTML Comments	HTML Style Guide
How to use Style Sheets	HTML Style Guide
How to load JavaScript in HTML	HTML Style Guide
How to access HTML Elements with JavaScript	HTML Style Guide
How to Use Lower Case File Names	HTML Style Guide
What is File Extensions	HTML Style Guide
What is the Differences Between .htm and .html?	HTML Style Guide
What is Default Filenames	HTML Style Guide

HTML Style Guide

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