diff --git a/etc/mkdocs.yaml b/etc/mkdocs.yaml
index 875ced73..b377bb66 100644
--- a/etc/mkdocs.yaml
+++ b/etc/mkdocs.yaml
@@ -31,6 +31,7 @@ extra_css:
 
 markdown_extensions:
   - admonition
+  - attr_list
   - pymdownx.highlight
   - pymdownx.inlinehilite
   - pymdownx.superfences
@@ -67,6 +68,7 @@ theme:
     - content.action.view
     - content.code.copy
     - content.tooltips
+    - navigation.footer
     - navigation.instant
     - navigation.instant.progress
     - navigation.sections
diff --git a/gulpfile.js b/gulpfile.js
index fa1f641c..ce2731ea 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -17,10 +17,9 @@ export function clean() {
 
 // Builds the documentation.
 export async function doc() {
+	for (const file of ["CHANGELOG.md", "LICENSE.md"]) await cp(file, `docs/${file.toLowerCase()}`);
 	await build();
 	await $`typedoc --options etc/typedoc.js`;
-	for (const file of ["CHANGELOG.md", "LICENSE.md"]) await cp(file, `docs/${file.toLowerCase()}`);
-	return cp("docs/favicon.ico", "docs/api/favicon.ico");
 }
 
 // Performs the static analysis of source code.
diff --git a/src/author.ts b/src/author.ts
index 6b26f35a..60837a22 100644
--- a/src/author.ts
+++ b/src/author.ts
@@ -105,7 +105,7 @@ export interface AuthorOptions {
 	/**
 	 * The URL of the author's website.
 	 */
-	url: string;
+	url: URL|string;
 
 	/**
 	 * The author's user agent, that is the string identifying the Web browser used to submit comments.
diff --git a/src/blog.ts b/src/blog.ts
index 1c6ee23a..f9a1f4bd 100644
--- a/src/blog.ts
+++ b/src/blog.ts
@@ -71,5 +71,5 @@ export interface BlogOptions {
 	/**
 	 * The blog or site URL.
 	 */
-	url: string;
+	url: URL|string;
 }
diff --git a/src/comment.ts b/src/comment.ts
index 3d8d73ef..1f97f75b 100644
--- a/src/comment.ts
+++ b/src/comment.ts
@@ -132,7 +132,7 @@ export interface CommentOptions {
 	/**
 	 * The permanent location of the entry the comment is submitted to.
 	 */
-	permalink: string;
+	permalink: URL|string;
 
 	/**
 	 * The UTC timestamp of the publication time for the post, page or thread on which the comment was posted.
@@ -147,7 +147,7 @@ export interface CommentOptions {
 	/**
 	 * The URL of the webpage that linked to the entry being requested.
 	 */
-	referrer: string;
+	referrer: URL|string;
 
 	/**
 	 * The comment's type.