Allows to add or remove previous siblings of text interpolations (e.g. by added `<script>` tags for content reproduction, or by removed `<style>` tags). Also calculates correctly whether an element is empty. Fixes #2591
Allows to add or remove previous siblings of text interpolations (e.g. by added `<script>` tags for content reproduction, or by removed `<style>` tags). Also calculates correctly whether an element is empty. Fixes #2591