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BMT Systems

  WEB CODING, TUTORIALS, AND COOKBOOK  

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Resources

Resources

Site and Code Auditors

Linters

JSLint
ESLint
TestMyCSS

Validators

W3C HTML Validator
HTML5 Structural Validator
W3C CSS Validation Service
Online JSON validator

Minifiers & Beautifiers

Google Closure Compiler (for JavaScript)
Kangax HTML minifier
JSON minifier
CSS Formatter

Formal Auditors

PageSpeed Insights
Lighthouse
GTMetrix
Dareboost
Varvy Page Speed Optimization
Pingdom
WebPageTest

Site Security

CSP evaluator
Security Headers
Mozilla Observatory

Accessibility

WAVE Accessibility Tool (online version)
WAVE Accessibility Tool (Browser Extensions)
WAVE Text and Background Color-contrast Checker
AXE Color-contrast Checker (Online version)
AXE Chrome Extension (more than just color-contrast analysis)
Automatic Color Generator for Text, Provided User-specified Background Color
W3C Aria Landmarks Primer
W3C Accessibility Evaluation Tools List
Sitepoint Accessibility Checker (Chrome Extension)
Evaluera (WCAG 2.0 Tester)

Semantics | Schema

A Primer on Schema
Structured Data Markup Helper (Requires Google Sign-in)
Google Structured Data Testing Tool
Yandex Structured Data Testing Tool
Rich Results Preview
Online Keyword Extractor

Favicons & Rich Links

Rich Link Previewer
Favicon Checker
Facebook Metadata Checker
Favicon Generator

SEO

SEO SiteCheckUp
SEOptimer
FOUND Seo Tool
Nibbler

Odds and Ends

Richard's Toolbox
Vendor Prefix Generator
CSS Specificity Calculator
Web Hypertext Application Technology Working Group (WHATWG)

Aside