Add formxxx attributes (for <input type="submit"> element) (#241)

Hello,

A small patch to add the following attributes:

- formaction
- formenctype
- formmethod
- formnovalidate
- formtarget

These attributes are useful in `<input type="submit">` element: [MDN
documentation](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/submit#additional_attributes)

1 files changed, 20 insertions, 0 deletions

diff --git a/html/attributes.go b/html/attributes.go
index e4cd796..6da541d 100644
--- a/html/attributes.go
+++ b/html/attributes.go
@@ -141,10 +141,30 @@ func For(v string) g.Node {
 	return g.Attr("for", v)
 }
 
+func FormAction(v string) g.Node {
+	return g.Attr("formaction", v)
+}
+
 func FormAttr(v string) g.Node {
 	return g.Attr("form", v)
 }
 
+func FormEncType(v string) g.Node {
+	return g.Attr("formenctype", v)
+}
+
+func FormMethod(v string) g.Node {
+	return g.Attr("formmethod", v)
+}
+
+func FormNoValidate() g.Node {
+	return g.Attr("formnovalidate")
+}
+
+func FormTarget(v string) g.Node {
+	return g.Attr("formtarget", v)
+}
+
 func Height(v string) g.Node {
 	return g.Attr("height", v)
 }