Jens Oliver Meiert

Diagnostic Styling Reloaded

Post from August 1, 2009 (↻ May 6, 2021), filed under .

This and many other posts are also available as a pretty, well-behaved ebook: On Web Development. And speaking of which, here’s a short treatise just about managing the quality of websites: The Little Book of Website Quality Control.

Eric cultivated the concept of “diagnostic styling,” meaning using CSS to track down problems within HTML documents. I’ve been working with diagnostic style sheets for general quality assurance or to uncover specific semantics or maintainability problems mostly through bookmarklets. One of these bookmarklet style sheets is now publicly available on Google Project Hosting GitHub:

QA Style Sheet.

I wrote this style sheet a couple of months ago for Google, not necessarily following specific needs but to provide an additional quality-related tool. To follow many other—though obviously much more impactful—examples of Google sharing code, I decided to make that QA style sheet public, too, on Google Project Hosting GitHub so to play with that as well. This should explain both hosting and licensing of this rather small project.

Some things on the QA Style Sheet’s site are still work in progress. Above all I couldn’t directly link a bookmarklet of the style sheet, which is the most useful way of working with it (that bookmarklet link is available on a separate page). There are many ways to inform me about issues though, be it on the project site or in this place. While I hope it’s not difficult to understand what the style sheet does and why, I hope to slowly extend the site’s documentation.

Tweet this? (If it changed your life, you delight me with a coffee.)

About Me

Jens Oliver Meiert, on April 29, 2020.

I’m Jens Oliver Meiert, and I’m a web developer (engineering manager) and author. I love trying things, sometimes including philosophy, art, and adventure. Here on I share some of my views and experiences.

If you have questions or suggestions about what I write, please leave a comment (if available) or a message.

Comments (Closed)

  1. On August 1, 2009, 14:43 CEST, Neovov said:

    This is freakin’ excelent ! Thanks a lot, I’m gonna over-use it !

  2. On August 1, 2009, 21:55 CEST, Vladimir said:

    Useful. Thank you for sharing.
    I was thinking of building something similar, but with powerful tools like Firebug doesn’t make much sense now. It will be cool to make bookmarklet for IE6 who will simulate the DIV behavior.

  3. On August 4, 2009, 16:22 CEST, Jens Oliver Meiert said:

    Thanks, Nicolas, Vladimir (I’ve noticed that you’re experimenting a bit with bookmarklets, too).

Read More

Have a look at the most popular posts, possibly including:

Cover: CSS Optimization Basics.

Perhaps my most relevant book: CSS Optimization Basics (2018). Writing CSS is a craft. As craftspeople we strive to write high quality CSS. In CSS Optimization Basics I lay out some of the most important aspects of such CSS. Available at Amazon, Google Play Books, and Leanpub.

Stay up-to-date? Follow me by feed or on Twitter.

Looking for a way to comment? Comments have been disabled, unfortunately.

Found a mistake? Email me,

You are here: HomeArchive2009 → Diagnostic Styling Reloaded

Last update: May 6, 2021

“Work is love made visible.”