v0.1.26810 Sep 2026·Rendering, JavaScript & JIT

JSON conversion matches the standard, including circular data

JavaScript's built-in JSON conversion brought closer to the standard. Turning data that refers back to itself into JSON now reports a clear error the way every browser does, instead of running away until the page freezes. Choosing exactly which fields to include now follows the order you list them in and drops duplicates, as the standard describes. And controlling the indentation of the output with a wrapped number or piece of text now works, including any custom conversion that value defines. Code that was already correct is unchanged. The JavaScript language aspect moves 94 to 95; the overall platform score stays at 70.

Parity with the reference browser

74overall, as of v0.1.355

Web APIs / DOM surface53

Security architecture66

GPU / graphics acceleration68

DevTools / extensions72

Networking85

Media85

Accessibility85

Real-world site compatibility99

HTML parsing100

CSS parsing + selectors100

Layout: block / flex / grid / tables / writing-modes100

Paint + visual100

JavaScript language100

JavaScript performance (JIT)100

HTML parsing100

What changed 3 changes

JavaScript & JIT	Converting self-referential data reports a clear error. When an object or array refers back to itself, turning it into JSON now stops with a clear error the moment the loop is detected, exactly as the standard requires, instead of running on until the page freezes. This removes a way a page could hang.
JavaScript & JIT	Choosing which fields to include respects order and duplicates. When you pass a list of field names to include in the JSON output, the result now follows the order of that list and ignores repeated names, as the standard describes, rather than falling back to the object's own order.
Rendering	Custom indentation and value conversion are honored. Setting the indentation with a wrapped number or piece of text now works, and a value that defines its own conversion has that conversion run wherever it is used, so custom number and text types behave consistently.