diff --git a/core/src/avm1/activation.rs b/core/src/avm1/activation.rs
index 0025d12d3..30e9c7fba 100644
--- a/core/src/avm1/activation.rs
+++ b/core/src/avm1/activation.rs
@@ -4,7 +4,7 @@ use crate::avm1::function::{Avm1Function, ExecutionReason, FunctionObject};
 use crate::avm1::object::{Object, TObject};
 use crate::avm1::property::Attribute;
 use crate::avm1::runtime::skip_actions;
-use crate::avm1::scope::Scope;
+use crate::avm1::scope::{Scope, ScopeClass};
 use crate::avm1::{fscommand, globals, scope, ArrayObject, ScriptObject, Value};
 use crate::backend::navigator::{NavigationMethod, Request};
 use crate::context::UpdateContext;
@@ -2970,6 +2970,17 @@ impl<'a, 'gc> Activation<'a, 'gc> {
         self.scope = scope;
     }
 
+    pub fn set_scope_to_display_object(&mut self, object: DisplayObject<'gc>) {
+        self.scope = Gc::new(
+            self.context.gc_context,
+            Scope::new(
+                self.scope,
+                ScopeClass::Target,
+                object.object().coerce_to_object(self),
+            ),
+        );
+    }
+
     /// Whether this activation operates in a local scope.
     pub fn in_local_scope(&self) -> bool {
         let mut current_scope = Some(self.scope);
diff --git a/core/src/display_object/edit_text.rs b/core/src/display_object/edit_text.rs
index 01e9f9e32..8552d1d2e 100644
--- a/core/src/display_object/edit_text.rs
+++ b/core/src/display_object/edit_text.rs
@@ -1600,6 +1600,45 @@ impl<'gc> EditText<'gc> {
             x: union_bounds.offset_x() + Twips::from_pixels(EditText::INTERNAL_PADDING),
         })
     }
+
+    fn execute_avm1_asfunction(
+        self,
+        context: &mut UpdateContext<'_, 'gc>,
+        address: &WStr,
+    ) -> Result<(), crate::avm1::Error<'gc>> {
+        let mut activation = Avm1Activation::from_nothing(
+            context.reborrow(),
+            ActivationIdentifier::root("[EditText URL]"),
+            self.avm1_root(),
+        );
+        // [NA]: Should all `from_nothings` be scoped to root? It definitely should here.
+        activation.set_scope_to_display_object(self.avm1_root());
+        let this = self.avm1_root().object().coerce_to_object(&mut activation);
+
+        if let Some((name, args)) = address.split_once(b',') {
+            let name = AvmString::new(activation.context.gc_context, name);
+            let args = AvmString::new(activation.context.gc_context, args);
+            let function = activation.get_variable(name)?;
+            function.call_with_default_this(this, name, &mut activation, &[args.into()])?;
+        } else {
+            let name = AvmString::new(activation.context.gc_context, address);
+            let function = activation.get_variable(name)?;
+            function.call_with_default_this(this, name, &mut activation, &[])?;
+        }
+        Ok(())
+    }
+
+    fn open_url(self, context: &mut UpdateContext<'_, 'gc>, url: &WStr, target: &WStr) {
+        if let Some(address) = url.strip_prefix(WStr::from_units(b"asfunction:")) {
+            if let Err(e) = self.execute_avm1_asfunction(context, address) {
+                error!("Couldn't execute URL \"{url:?}\": {e:?}");
+            }
+        } else {
+            context
+                .navigator
+                .navigate_to_url(&url.to_utf8_lossy(), &target.to_utf8_lossy(), None);
+        }
+    }
 }
 
 impl<'gc> TDisplayObject<'gc> for EditText<'gc> {
@@ -1955,11 +1994,19 @@ impl<'gc> TInteractiveObject<'gc> for EditText<'gc> {
             let tracker = context.focus_tracker;
             tracker.set(Some(self.into()), context);
         }
-        if let Some(position) = self
-            .screen_position_to_index(*context.mouse_position)
-            .map(TextSelection::for_position)
-        {
-            self.0.write(context.gc_context).selection = Some(position);
+        if let Some(position) = self.screen_position_to_index(*context.mouse_position) {
+            self.0.write(context.gc_context).selection =
+                Some(TextSelection::for_position(position));
+
+            let format = self.0.read().text_spans.get_text_format(position, position);
+            if let Some(url) = format.url {
+                if !url.is_empty() {
+                    // TODO: This fires on mouse DOWN but it should be mouse UP...
+                    // but only if it went down in the same span.
+                    // Needs more advanced focus handling than we have at time of writing this comment.
+                    self.open_url(context, &url, &format.target.unwrap_or_default());
+                }
+            }
         } else {
             self.0.write(context.gc_context).selection =
                 Some(TextSelection::for_position(self.text_length()));
diff --git a/tests/tests/swfs/avm1/asfunction/input.json b/tests/tests/swfs/avm1/asfunction/input.json
new file mode 100644
index 000000000..81681fc0d
--- /dev/null
+++ b/tests/tests/swfs/avm1/asfunction/input.json
@@ -0,0 +1,42 @@
+[
+  {
+    "type": "MouseDown",
+    "pos": [134, 69],
+    "btn": "Left"
+  },
+  {
+    "type": "MouseUp",
+    "pos": [134, 69],
+    "btn": "Left"
+  },
+  {
+    "type": "MouseDown",
+    "pos": [166, 95],
+    "btn": "Left"
+  },
+  {
+    "type": "MouseUp",
+    "pos": [166, 95],
+    "btn": "Left"
+  },
+  {
+    "type": "MouseDown",
+    "pos": [143, 128],
+    "btn": "Left"
+  },
+  {
+    "type": "MouseUp",
+    "pos": [143, 128],
+    "btn": "Left"
+  },
+  {
+    "type": "MouseDown",
+    "pos": [142, 160],
+    "btn": "Left"
+  },
+  {
+    "type": "MouseUp",
+    "pos": [142, 160],
+    "btn": "Left"
+  }
+]
\ No newline at end of file
diff --git a/tests/tests/swfs/avm1/asfunction/output.txt b/tests/tests/swfs/avm1/asfunction/output.txt
new file mode 100644
index 000000000..dae38b37c
--- /dev/null
+++ b/tests/tests/swfs/avm1/asfunction/output.txt
@@ -0,0 +1,6 @@
+alert1 called with input: undefined
+// this
+_level0
+
+_level0.callback with input:  Second Test
+text1.callback with input: a,b,c,d
diff --git a/tests/tests/swfs/avm1/asfunction/test.fla b/tests/tests/swfs/avm1/asfunction/test.fla
new file mode 100644
index 000000000..20c65cf6e
Binary files /dev/null and b/tests/tests/swfs/avm1/asfunction/test.fla differ
diff --git a/tests/tests/swfs/avm1/asfunction/test.swf b/tests/tests/swfs/avm1/asfunction/test.swf
new file mode 100644
index 000000000..91d6bdd37
Binary files /dev/null and b/tests/tests/swfs/avm1/asfunction/test.swf differ
diff --git a/tests/tests/swfs/avm1/asfunction/test.toml b/tests/tests/swfs/avm1/asfunction/test.toml
new file mode 100644
index 000000000..cf6123969
--- /dev/null
+++ b/tests/tests/swfs/avm1/asfunction/test.toml
@@ -0,0 +1 @@
+num_ticks = 1
diff --git a/wstr/src/common.rs b/wstr/src/common.rs
index d9a5aed4e..9889bd56a 100644
--- a/wstr/src/common.rs
+++ b/wstr/src/common.rs
@@ -382,6 +382,12 @@ impl WStr {
         (&self[..index], &self[index..])
     }
 
+    /// Analogue of [`str::split_once`].
+    #[inline]
+    pub fn split_once<'a, P: Pattern<'a>>(&'a self, pattern: P) -> Option<(&'a WStr, &'a WStr)> {
+        super::ops::str_split_once(self, pattern)
+    }
+
     /// Analogue of [`str::rsplit_once`].
     #[inline]
     pub fn rsplit_once<'a, P: Pattern<'a>>(&'a self, pattern: P) -> Option<(&'a WStr, &'a WStr)> {
diff --git a/wstr/src/ops.rs b/wstr/src/ops.rs
index 9d9250048..9facb19d9 100644
--- a/wstr/src/ops.rs
+++ b/wstr/src/ops.rs
@@ -327,6 +327,14 @@ pub fn str_split<'a, P: Pattern<'a>>(string: &'a WStr, pattern: P) -> Split<'a,
     }
 }
 
+pub fn str_split_once<'a, P: Pattern<'a>>(
+    string: &'a WStr,
+    pattern: P,
+) -> Option<(&'a WStr, &'a WStr)> {
+    let (start, end) = pattern.into_searcher(string).next_match()?;
+    Some((&string[..start], &string[end..]))
+}
+
 pub fn str_rsplit_once<'a, P: Pattern<'a>>(
     string: &'a WStr,
     pattern: P,