Jens Oliver Meiert

July 2021

HTML Concepts: Constraint Validation

When a form element has attributes that define requirements for the element’s value, then these requirements—constraints—are being validated by the user agent. On the validation of constraints, validity states, and a link to CSS.

Post from July 27, 2021, filed under .

CSS: “:has()” and the Lost Paradigm

On the :has() pseudo-class and the forgotten school of ID- and class-less development.

Post from July 21, 2021, filed under .

The 3-Second Frontend Developer Test

“Do you validate?” Be a frontend developer who ships valid HTML and CSS; hire frontend developers who ship valid HTML and CSS. End the time of unconditionally accepted sloppiness in professional frontend development.

Post from July 14, 2021, filed under .

If you like what you see here, consider the ebook version of all of my 2005–2015 posts on web design and development: On Web Development.

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Cover: 100 Things I Learned as an Everyday Adventurer.

Perhaps my most interesting book: 100 Things I Learned as an Everyday Adventurer (2013). During my time in the States I started trying everything. Everything. Then I noticed that wasn’t only fun, it was also useful. Available at Amazon, Apple Books, Google Play Books, and Leanpub.

Cover: Journey of J.

Perhaps my most personal and also most unusual book: Journey of J. (2015). A freestyle documentary of 557 days of travel across 6 continents and 48 countries. Available at Amazon.

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Last update: July 27, 2021

Professional frontend developers produce valid HTML and CSS.