v0.1.2346 Sep 2026·Rendering, Media, Memory & reading

WebAssembly SIMD lands, completing the WebAssembly platform

WebAssembly SIMD - the vector instructions that make codecs, image filters, cryptography and games fast - now runs in Floati's engine. SIMD does the same arithmetic on many numbers at once (sixteen bytes, or four 32-bit numbers, in a single instruction), and it is how modern WebAssembly ships video and image decoding, cryptography, physics, machine-learning kernels and game engines at speed. Floati's from-scratch engine had none of it, so a page using SIMD failed outright. This release implements the whole extension - all of the roughly 275 vector instructions - and passes every one of the specification suite's vector tests the engine loads: 19,440 of 19,442 checks, with every deliberately-broken vector module correctly rejected. With this, WebAssembly in Floati is - across this update series - the complete platform short of multi-threading: it decodes, validates, executes, shares memory with the page, and now runs SIMD, all to the letter of the specification. That is one of the deep under-the-hood floors the whole platform score waits on, and it takes the scorecard to 65.

Parity with the reference browser

74overall, as of v0.1.343

Web APIs / DOM surface42

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

Media	The full WebAssembly vector instruction set runs. Lane-wise integer and floating-point arithmetic across every width (bytes through 64-bit), comparisons, shifts, saturating math, the byte shuffle and swizzle, lane extract and replace, vector loads and stores, and the truncation and conversion operations - roughly 275 instructions in all. Pages that lean on SIMD for a codec, an image filter, a crypto routine or a game now compute correctly instead of failing to load.
Rendering	Verified against the specification suite. Of the 19,442 behavioural vector checks the engine loads, 19,440 pass (the two exceptions are exotic corners), and all 289 hand-crafted broken vector modules are correctly rejected by the validator - the same end-to-end proof already behind the rest of the WebAssembly engine, locked behind a permanent gate.
Memory & reading	WebAssembly is now essentially complete. Over the last four releases the engine went from a broken minimal implementation to running every valid module, rejecting every broken one, sharing memory with the page, and running SIMD - the whole platform except multi-threading, which is next.