CSS Color Scheme:
CSS named colors
Comprehensive guide to all 147 CSS color keywords, including their 142 named colors. List of all CSS Color Module Level 4 named colors. Includes hex, RGB, and HSL values.
Standards
Collection of publications tagged with standard.
Encryption Software:
Difference between GPG and PGP
Learn the key differences between PGP, GPG, OpenPGP, and LibrePGP. This guide covers licensing, cost, interoperability, and platform support in detail.
Character Encoding:
HTML entities cheat sheet
Complete HTML entity reference list. Includes symbols, arrows, mathematical operators, and special characters in Unicode, hex, decimal, named entity, and CSS codes.
Web Standards:
HTML void elements
The concept of void elements in HTML and how they differ from self-closing tags in XML, XHTML, and SVG. Highlighting, syntax, and parsing differences.
Internet Standards:
HTTP status codes list
List of all Hypertext Transfer Protocol (HTTP) response status codes, the standardized, three-digit messages from servers indicating the outcome of client requests.
Date and Time on the Internet:
Internet Timestamps - Date and Time on the Internet
Guide to RFC 3339 and IXDTF timestamp formats with syntax, examples, and format specifiers. Timestamp grammar, timestamp comparisons, and practical usage.
Privacy on the Web:
Introduction to Referrer Policy
Learn what the Referrer Policy is, why it matters for privacy, and how you can control it using simple directives to stay compliant and protect user data.
Web Security:
Introduction to Subresource Integrity (SRI)
Subresource Integrity (SRI) secures websites by validating external resources with cryptographic hashes. Learn how to implement SRI to protect users from tampered resources for their security.
ISO Standards:
ISO 3166-1 country codes
List of ISO 3166-1 alpha-2 and Alpha-3 country codes, along with the corresponding country code top-level domain (ccTLD) and country phone dial code.
ISO Standards:
ISO 639 language names and codes
Complete list of ISO 639 language names (including native names) and their corresponding ISO 639-1 Alpha-2 language codes. For use in e.g. HTML lang and hreflang attribute values.
Linux Administration:
List of Linux exit status codes
List of standard and custom Linux exit status codes. Numeric values returned by commands or scripts, indicating success, failure, or specific error conditions.
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