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CSS Validation Service
W3C's online validator for checking CSS syntax and identifying errors against CSS standards.
CSS, Web Standards·BeginnerAdvanced
Interactive·Web Development
Explain Shell
An interactive command-line reference that breaks down shell commands into their individual components and explains what each part of a command does.
Bash, Shell·Beginner
Interactive·Systems & Infrastructure
Markup Validation Service
W3C's online service for validating HTML and markup against web standards and identifying syntax or structural errors.
HTML, Web Standards·BeginnerAdvanced
Interactive·Web Development