They say that machines are not human, but humans are not machines either, therefore for certain tasks it is advisable to leave them to the machines, even if we review their results later. Here I leave you a series of links that may be useful for testing our web applications:

HTML:

The W3C Markup Validation Service

WDG HTML Validator

HTML / XHTML / WML / XML Validator

HTML Optimizer

More

CSS:

W3C CSS Validation Service

CSSCheck: CSS Validation.

CSS Analyzer: CSS analysis.

 

Accessibility

Global analysis:

TAW

WebXACT

Site Check - Web Site Test Tool

Web Page Reports

Craig Cecil

AboutUrl.com

Broken links:

W3C Link Checker

Link Valet

Broken-Links.com

Link Valet

 

Positioning

Feeds:

RSS Validator

Feed Validator

W3C Feed Validation Service, for Atom and RSS

Charging time:

Web Page Analyzer:

Loading time checker

MonitoreoInternet.com - Website Check

Website Goodies - Website Speed ​​Test

Website Speed ​​Test

Vision depending on screen size:

Screen Size Tester

Others:

Readability Test: Readability.

UITest.com