Cannot read properties of undefined (reading 'DOM')

[paro 2 Likes (Newbie)]

Hi there,

Cannot read properties of undefined (reading 'DOM')

I got this error while working on my project, i couldn't find a solution for that. What i am missing here? 

See the Pen NWybXmy by tw_parodia (@tw_parodia) on CodePen

[mvaneijgen 561 Likes (Leader)]

I've created an arrow function of your matchMedia query and that seems to work.`this.` will otherwise be scoped to its parent function 

"(min-width: 800px)": function() {

 

"(min-width: 800px)":() => {

See the Pen MWQbQXg?editors=0011 by mvaneijgen (@mvaneijgen) on CodePen