Recently, the two major Web engines (WebKit and Chromium) adopted fast SIMD routines to scan HTML content. The key insight is to use vectorized classification (Langdale and Lemire, 2019): you load blocks of characters and identify the characters you seek using a few instructions. In particular, we use ‘SIMD instructions’, special instructions that are available on practically all modern processors and can process 16 bytes or more at once. The problem that WebKit and Chromium solve is to jump to ...