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BMT Systems

  WEB CODING, TUTORIALS, AND COOKBOOK  

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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
TinyPNG

Formal Auditors

PageSpeed Insights
Lighthouse
GTMetrix
Yellow Lab Tools
Dareboost
Varvy Page Speed Optimization
Pingdom
WebPageTest
WebHint

Compression/Speed Enabled Tests

GiftOfSpeed (Gzip test)
IPVOID Brotli Test
KeyCDN HTTP/2 Test

Site Security

CSP evaluator
Security Headers
Web Sniffer (view HTTP request and response 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
Xoocode (Adavanced Schema Markup Examples)
Structured Data Markup Helper (Requires Google Sign-in)
Google Structured Data Testing Tool
Google Structured Data Examples: Article (with links to other schema types)
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
SEMrush

Odds and Ends

Meta Tags
Vendor Prefix Generator
CSS Specificity Calculator
Sitemap Generator
Web Hypertext Application Technology Working Group (WHATWG)

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