From 8315ad67595e98bacc81a0100bf9e239e9cef7cf Mon Sep 17 00:00:00 2001
From: Jamie Mansfield <jmansfield@cadixdev.org>
Date: Mon, 27 May 2024 09:46:36 +0100
Subject: [PATCH] LibWeb: Implement HTMLImageElement.fetchPriority

---
 .../HTML/img-element-fetch-priority.txt        |  5 +++++
 .../input/HTML/img-element-fetch-priority.html | 18 ++++++++++++++++++
 .../Libraries/LibWeb/HTML/HTMLImageElement.cpp |  3 ++-
 .../Libraries/LibWeb/HTML/HTMLImageElement.idl |  2 +-
 4 files changed, 26 insertions(+), 2 deletions(-)
 create mode 100644 Tests/LibWeb/Text/expected/HTML/img-element-fetch-priority.txt
 create mode 100644 Tests/LibWeb/Text/input/HTML/img-element-fetch-priority.html

diff --git a/Tests/LibWeb/Text/expected/HTML/img-element-fetch-priority.txt b/Tests/LibWeb/Text/expected/HTML/img-element-fetch-priority.txt
new file mode 100644
index 00000000000..c3a1c4708bd
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/HTML/img-element-fetch-priority.txt
@@ -0,0 +1,5 @@
+   fetchPriority = auto
+
+fetchPriority = high
+
+fetchPriority = auto
diff --git a/Tests/LibWeb/Text/input/HTML/img-element-fetch-priority.html b/Tests/LibWeb/Text/input/HTML/img-element-fetch-priority.html
new file mode 100644
index 00000000000..ae41552d589
--- /dev/null
+++ b/Tests/LibWeb/Text/input/HTML/img-element-fetch-priority.html
@@ -0,0 +1,18 @@
+<img id="testImg">
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        const img = document.getElementById('testImg');
+
+        println(`fetchPriority = ${img.fetchPriority}`);
+        println('');
+
+        img.fetchPriority = 'high';
+
+        println(`fetchPriority = ${img.fetchPriority}`);
+        println('');
+
+        img.fetchPriority = 'invalid-value';
+        println(`fetchPriority = ${img.fetchPriority}`);
+    });
+</script>
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp
index 7ae044cc51d..88375b0e012 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp
@@ -563,7 +563,8 @@ after_step_7:
         // 21. Set request's referrer policy to the current state of the element's referrerpolicy attribute.
         request->set_referrer_policy(ReferrerPolicy::from_string(get_attribute_value(HTML::AttributeNames::referrerpolicy)).value_or(ReferrerPolicy::ReferrerPolicy::EmptyString));
 
-        // FIXME: 22. Set request's priority to the current state of the element's fetchpriority attribute.
+        // 22. Set request's priority to the current state of the element's fetchpriority attribute.
+        request->set_priority(Fetch::Infrastructure::request_priority_from_string(get_attribute_value(HTML::AttributeNames::fetchpriority)).value_or(Fetch::Infrastructure::Request::Priority::Auto));
 
         // 24. If the will lazy load element steps given the img return true, then:
         if (will_lazy_load_element()) {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLImageElement.idl b/Userland/Libraries/LibWeb/HTML/HTMLImageElement.idl
index 6b80732bc91..cab5f7845d0 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLImageElement.idl
+++ b/Userland/Libraries/LibWeb/HTML/HTMLImageElement.idl
@@ -23,7 +23,7 @@ interface HTMLImageElement : HTMLElement {
     [FIXME, CEReactions] attribute DOMString referrerPolicy;
     [FIXME, CEReactions] attribute DOMString decoding;
     [CEReactions, Enumerated=LazyLoadingAttribute, Reflect] attribute DOMString loading;
-    [FIXME, CEReactions] attribute DOMString fetchPriority;
+    [CEReactions, Enumerated=FetchPriorityAttribute, Reflect=fetchpriority] attribute DOMString fetchPriority;
 
     [FIXME] Promise<undefined> decode();