Explainer ·
The Header That Carries Your Dark Mode
Your light or dark mode setting can leave the machine as an HTTP request header. The same channel carries your motion and contrast preferences too.
Articles
9 articles, newest first.
Explainer ·
What Replaced the User-Agent String
The User-Agent string was trimmed to leak less. The detail it carried did not disappear - it moved to a channel the server switches on, and one engine answers.
Explainer ·
The Request That Describes Your Device
Before your JavaScript runs, the browser can already have told the server how much RAM your device has and how fast your connection is, rounded off on purpose.
Explainer ·
The Page You Never Opened Has Already Loaded
Two hundred milliseconds of hover can be enough for the destination to load in full, run all of its JavaScript, and count you as a visitor.
Explainer ·
Not All Bytes Cost the Same
A kilobyte is treated as a fixed unit of harm. It is not: a kilobyte of JavaScript and a kilobyte of image do very different amounts of damage.
Explainer ·
The Codec Your Browser Picked, and Why It Was Not Your Choice
The same page can hand two people different encodes of one video. A negotiation before playback picks which, and the browser's answers are deliberately vague.
Explainer ·
What an Embedded Third-Party Script Actually Gets
A script tag and an iframe look like the same act of embedding. They are opposites: one hands over the page, the other holds the guest at arm's length.
Explainer ·
What Actually Happens to a Video Before You See It
A video is not a file you are sent. It is a few hundred short segments, published at several qualities, and a running guess about which one to fetch next.
Explainer ·
What a Page Knows About You Before You Click Anything
Loading a page is not a neutral act. A set of identifying details arrives with the request itself, before any script runs and before you touch the screen.