Articles by

Mat Marquis

Mat “Wilto” Marquis is the author of JavaScript for Everyone from Piccalil.li, a course designed to help you understand JavaScript deeply. Mat keeps busy. In the past he has been been a member of the jQuery Team, an editor of the HTML specification, author of multiple books with A Book Apart and courses for the Chrome team's web.dev learning platform, and speaker at conferences like An Event Apart and Smashing Conference. He was even in the movie What Comes Next is the Future to discuss his role as Chair of the standards group responsible for bringing responsive image markup to the web platform — he has an IMDB page for it and everything! Just… just ignore the other thing on there. Long story.

wil.to/

JavaScript

An Introduction to JavaScript Expressions

A thorough but approachable lesson on JavaScript expressions excerpted JavaScript For Everyone, a complete online course offered by our friends at Piccalilli.

Oct 22, 2025

accessibility

Accessibility Events

“There isn’t some way to know when—…?”

There is always a pause here. The client knows what they’re asking, and I know what they’re asking, but putting it into words—saying it out loud—turns unexpectedly difficult.

In the moments before the …

Apr 11, 2019 Updated on May 7, 2019

Please Update Picturefill

The following is a guest post by Mat Marquis. Mat has a important PSA for us regarding responsive images.

I don’t want to bury the lede: if you’re using a version of Picturefill from prior to 2.3.1, please update …

May 26, 2015 Updated on Apr 11, 2017