DiagnostiCSS

Diagnostic CSS stylesheet that helps visually detect any potentially invalid, inaccessible or erroneous HTML markup.

DiagnostiCSS highlights the following problems:

Installation & Usage

Add this line to your application's Gemfile:

gem 'diagnosticss', github: 'diagnosticss', group: :development

And run:

$ bundle install

Add 'diagnosticss' to your application's Gemfile as described above and then use DiagnostiCSS middleware in your application:

require 'diagnosticss'

class App < Sinatra::Base
  use Diagnosticss::Middleware
  # ...
end

Include a stylesheet link to the diagnostic css:

<link rel="stylesheet" href="//diagnosticss.github.io/css/diagnosticss.css" media="all">

Yep. This is it. Courtesy of @nicck, @kamilhism. Install it from Chrome Webstore.

Fork it
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Don't forget to run rake compile (see also rake -T) after making any changes to stylesheet
Create new Pull Request