It's not actually V8, but mentioned in the post: the fast path HTML parser is great for client-side rendering with <template> elements. <template>s content is

It's not actually V8, but mentioned in the post: the fast path HTML parser is great for client-side rendering with <template> elements. <template>s content is often created with .innerHTML and because the contents are inert they're always on the fast path as parsing doesn't have to create any DOM associations.