Renders each custom element in the given sources to static HTML using
Declarative Shadow DOM (<template shadowrootmode="open">), the
Baseline-supported primitive for server-rendering shadow DOM with no
JavaScript. Components are mounted in JSDOM (via TestHelper) and their
shadow root is serialized. Elements without a shadow root are emitted as a
plain tag. Returns one PrerenderResult per element.
Renders each custom element in the given sources to static HTML using Declarative Shadow DOM (
<template shadowrootmode="open">), the Baseline-supported primitive for server-rendering shadow DOM with no JavaScript. Components are mounted in JSDOM (via TestHelper) and their shadow root is serialized. Elements without a shadow root are emitted as a plain tag. Returns one PrerenderResult per element.