1 files changed, 14 insertions, 0 deletions
diff --git a/src/shared/modify-dom.ts b/src/shared/modify-dom.ts
index 22b8e8e..b268ae2 100644
--- a/src/shared/modify-dom.ts
+++ b/src/shared/modify-dom.ts
@@ -10,6 +10,11 @@ type DOMModificationRules = (DOMModificaitonRule | null)[];
 let domModificationRules: DOMModificationRules = [];
 let domModificationFinishedCount = 0;
 
+/**
+ * Runs whenever the DOM mutates.  Iterates over pending modification
+ * rules; when the selector matches, the element's innerHTML and
+ * attributes are updated and the rule is marked as complete.
+ */
 observeDOM(() => {
 	for (let i = 0; i < domModificationRules.length; i++) {
 		if (domModificationRules[i]) {
@@ -45,6 +50,15 @@ observeDOM(() => {
 	return false;
 });
 
+/**
+ * Registers one or more DOM modification rules.  Each rule is a tuple of
+ * `[selector, attributeMap]`.  When an element matching the selector is
+ * found, its `innerHTML` is replaced (if `attributeMap.innerHTML` is set)
+ * and all other entries in the map are applied as `setAttribute` calls
+ * (or `removeAttribute` when the value is `null`).
+ *
+ * @param modificationRules - Array of `[selector, attributes]` rules.
+ */
 export function modifyDOM(modificationRules: DOMModificationRules) {
 	domModificationRules = domModificationRules.concat(modificationRules);
 };