Attribute value is not yet defined for tag input

[renatoathaydes]

Got the following error trying to get the value of an input:

message: "Attribute value is not yet defined for tag input"

Code:

import kotlinx.browser.document
import kotlinx.html.div
import kotlinx.html.dom.append
import kotlinx.html.h2
import kotlinx.html.id
import kotlinx.html.input
import kotlinx.html.js.onKeyUpFunction
import kotlinx.html.style
import kotlinx.html.unsafe
import org.w3c.dom.HTMLElement

object HtmlIds {
    const val base58Result = "base58-result"
}

/**
 * Test application for the base58 library.
 *
 * It helps test that the code works on a browser.
 */
fun main() {
    byId("root").append {
        h2 {
            +"Enter some text:"
        }
        input {
            placeholder = "Text to encode to base58"
            onKeyUpFunction = { _ ->
                byId(HtmlIds.base58Result).textContent = value
            }
        }
        div {
            id = HtmlIds.base58Result
            style {
                unsafe { raw("padding: 10px; background: green; color: white") }
            }
        }
    }
}

private fun byId(id: String): HTMLElement {
    return (document.getElementById(id) as HTMLElement?)!!
}