The plain-English version
JavaScript execution in a worker context separate from a page’s main execution context.
Why it matters
It can move suitable computation away from work that handles interface interaction.
Let’s make it click
A large text analysis runs in a worker while the page remains available for input.
Vibe Bro’s heads-up
A worker cannot directly manipulate the page DOM, and moving data between contexts has costs.
The docs behind it
Documentation links checked .
Editorial review · October 28, 2026
Supported: MDN states workers cannot directly manipulate the DOM and communicate through messages. The workload example and transfer-cost caution are appropriate.