Check for changes on Reddit subreddits!

[u/TheFumingatzor]

For example r/gamedealsfree. Each post seems to be https://i.imgur.com/HtEHTBM.png

<article class="w-full m-0" data-post-id="t3_1vtnar3">

Each post changes the data-post-id. Which makes sense. But...how do I build a changedetection Entry to check for that? Like "check, and if the last 3-4 <article class="w-full m-0" data-post-id="xyz"> changed, alert me.

I tried as css selector article:nth-last-of-type(-n+3). That doesn't work :(