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Test Info:

<!doctype html>
<script>
class CustomElement0 extends HTMLElement {
constructor () {
super()
}
static get observedAttributes () { return ["style"] }
async attributeChangedCallback () {
const animation = this.animate([{
"boxShadow": "none",
"visibility": "collapse"
}], 1957)
animation.commitStyles()
}
}
customElements.define("custom-element-0", CustomElement0)
window.addEventListener("load", () => {
const custom = document.createElement("custom-element-0")
document.documentElement.appendChild(custom)
custom.style.fontFamily = "family_name_0"
})
</script>