Add defer attribute to script tag

Author: MaddyGuthridge

meta/tags.yml

@@ -46,6 +46,9 @@ script:
       default: "'text/javascript'"
       type: "str | None"
     src: The location from which to load the script. If present, this will be used rather than the contents of the element.
+    defer:
+      doc: Defers execution of the script until the page has fully loaded.
+      type: "bool | None"
 
 style:
   escape_children: false

pyhtml/__tags/generated.py

@@ -4116,6 +4116,7 @@ class script(Tag):
 
     * `type`: Type of script to use (defaults to `'text/javascript'`)
     * `src`: The location from which to load the script. If present, this will be used rather than the contents of the element.
+    * `defer`: Defers execution of the script until the page has fully loaded.
 
     [View full documentation](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script)
     """
@@ -4124,19 +4125,22 @@ def __init__(
         *children: ChildrenType,
         type: str | None = None,
         src: AttributeType = None,
+        defer: bool | None = None,
         **attributes: AttributeType,
     ) -> None:
         """
         Used to embed executable code or data; this is typically used to embed or refer to JavaScript code. The `<script>` element can also be used with other languages, such as [WebGL](https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API)'s GLSL shader programming language and [JSON](/en-US/docs/Glossary/JSON).
 
         * `type`: Type of script to use (defaults to `'text/javascript'`)
         * `src`: The location from which to load the script. If present, this will be used rather than the contents of the element.
+        * `defer`: Defers execution of the script until the page has fully loaded.
 
         [View full documentation](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script)
         """
         attributes |= {
             'type': type,
             'src': src,
+            'defer': defer,
         }
         super().__init__(*children, **attributes)
 
@@ -4145,24 +4149,27 @@ def __call__(  # type: ignore
         *children: ChildrenType,
         type: str | None = None,
         src: AttributeType = None,
+        defer: bool | None = None,
         **attributes: AttributeType,
     ):
         """
         Used to embed executable code or data; this is typically used to embed or refer to JavaScript code. The `<script>` element can also be used with other languages, such as [WebGL](https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API)'s GLSL shader programming language and [JSON](/en-US/docs/Glossary/JSON).
 
         * `type`: Type of script to use (defaults to `'text/javascript'`)
         * `src`: The location from which to load the script. If present, this will be used rather than the contents of the element.
+        * `defer`: Defers execution of the script until the page has fully loaded.
 
         [View full documentation](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script)
         """
         attributes |= {
             'type': type,
             'src': src,
+            'defer': defer,
         }
         return super().__call__(*children, **attributes)
 
     def _get_default_attributes(self, given: dict[str, AttributeType]) -> dict[str, AttributeType]:
-        return {'type': 'text/javascript', 'src': None}
+        return {'type': 'text/javascript', 'src': None, 'defer': None}
 
 
     def _escape_children(self) -> bool: