Macro shadow_root 

macro_rules! shadow_root {
    ($this:ident, $mode:expr => { $($methods:tt)* }) => { ... };
}

Attaches a shadow root to a DomBuilder.

The first argument is the shadow root mode (ShadowRootMode::Open or ShadowRootMode::Closed).

The second argument is a block of method calls. Inside of the block you can use DomBuilder<web_sys::ShadowRoot> methods:

use web_sys::ShadowRootMode;

html!("div", {
    .shadow_root!(ShadowRootMode::Open, {
        .child(...)
        .child_signal(...)
        .children_signal_vec(...)
    })
})

The method calls are applied to the shadow root, not the parent DomBuilder.

The block uses the apply_methods! macro, see the docs for apply_methods! for more details.