Add use.whenReady function

use.js

@@ -32,6 +32,13 @@ export const run = (root = document) => {
 	root.querySelectorAll("[use]").forEach(use)
 }
 
+export const whenReady = () => {
+	if (document.readyState == "complete")
+		run(document)
+	else
+		document.addEventListener("readystatechange", whenReady, {once: true})
+}
+
 export const install = () => {
 	observe(document)
 	run(document)

use.md

@@ -43,11 +43,15 @@ use.observe(root=document)
 // child elements. Does not perform an initial run over
 // already existing elements.
 
-use.use(element)
-// Runs once on a selected element.
-// Normally not recommended.
-
 use.install()
 // Observes the entire document and performs
 // an initial scan over existing elements.
+
+use.whenReady()
+// Waits for the document to be ready, then
+// runs once on the whole document.
+
+use.use(element)
+// Runs once on a selected element.
+// Normally not recommended.
 ```