Potential compatibility with shadow DOM

[unit-404]

When using custom elements, needs to create icons again when inside of shadow DOM. Shadow DOM invisible from document selectors, so can't be replaced directly. There is no new any icon.

What is the purpose of this pull request?

• [ ] New Icon
• [ ] Bug fix
• [x] New Feature
• [ ] Documentation update
• [x] Other:

Description

Adds rootElement field for createIcons (default, is document).

Before Submitting

• [x] I've read the Contribution Guidelines.
• [x] I've checked if there was an existing PR that solves the same issue.

[ericfennis]

@unit-404 Cool idea! Did you already get it working?

Maybe we can also test this with libraries like Lit.

[unit-404]

About get working, I did it in separate code (re-wrap). I.e. re-created that function.

[github-actions[bot]]

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