LibWeb: Implement HTMLImageElement.currentSrc

Removes some console noise from lner.co.uk :)

Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp

@@ -269,6 +269,13 @@ bool HTMLImageElement::complete() const
     return false;
 }
 
+// https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-currentsrc
+String HTMLImageElement::current_src() const
+{
+    // The currentSrc IDL attribute must return the img element's current request's current URL.
+    return MUST(m_current_request->current_url().to_string());
+}
+
 Optional<ARIA::Role> HTMLImageElement::default_role() const
 {
     // https://www.w3.org/TR/html-aria/#el-img

Userland/Libraries/LibWeb/HTML/HTMLImageElement.h

@@ -57,6 +57,9 @@ public:
     // https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-complete
     bool complete() const;
 
+    // https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-currentsrc
+    String current_src() const;
+
     virtual Optional<ARIA::Role> default_role() const override;
 
     // https://html.spec.whatwg.org/multipage/images.html#img-environment-changes

Userland/Libraries/LibWeb/HTML/HTMLImageElement.idl

@@ -19,7 +19,7 @@ interface HTMLImageElement : HTMLElement {
     readonly attribute unsigned long naturalWidth;
     readonly attribute unsigned long naturalHeight;
     readonly attribute boolean complete;
-    [FIXME] readonly attribute USVString currentSrc;
+    readonly attribute USVString currentSrc;
     [FIXME, CEReactions] attribute DOMString referrerPolicy;
     [FIXME, CEReactions] attribute DOMString decoding;
     [CEReactions, Enumerated=LazyLoadingAttribute, Reflect] attribute DOMString loading;