Add additional set for <form method> inc. dialog value

…and capitalise GET / POST. Old get/post set is still needed for
formmethod on input and button.

src/vs/languages/html/common/htmlTags.ts

@@ -122,9 +122,9 @@ export function getHTML5TagProvider(): IHTMLTagProvider {
 		legend: none,
 		label: ['form', 'for'],
 		input: ['accept', 'alt', 'autocomplete:o', 'autofocus:v', 'checked:v', 'dirname', 'disabled:v', 'form', 'formaction', 'formenctype:et',
-			'formmethod:m', 'formnovalidate:v', 'formtarget', 'height', 'inputmode:im', 'list', 'max', 'maxlength', 'min', 'minlength', 'multiple:v', 'name',
+			'formmethod:fm', 'formnovalidate:v', 'formtarget', 'height', 'inputmode:im', 'list', 'max', 'maxlength', 'min', 'minlength', 'multiple:v', 'name',
 			'pattern', 'placeholder', 'readonly:v', 'required:v', 'size', 'src', 'step', 'type:t', 'value', 'width'],
-		button: ['autofocus:v', 'disabled:v', 'form', 'formaction', 'formenctype:et', 'formmethod:m', 'formnovalidate:v', 'formtarget', 'name', 'type:bt', 'value'],
+		button: ['autofocus:v', 'disabled:v', 'form', 'formaction', 'formenctype:et', 'formmethod:fm', 'formnovalidate:v', 'formtarget', 'name', 'type:bt', 'value'],
 		select: ['autocomplete:o', 'autofocus:v', 'disabled:v', 'form', 'multiple:v', 'name', 'required:v', 'size'],
 		datalist: none,
 		optgroup: ['disabled:v', 'label'],
@@ -158,7 +158,8 @@ export function getHTML5TagProvider(): IHTMLTagProvider {
 		b: ['true', 'false'],
 		u: ['true', 'false', 'undefined'],
 		d: ['ltr', 'rtl', 'auto'],
-		m: ['get', 'post'],
+		m: ['GET', 'POST', 'dialog'],
+		fm: ['GET', 'POST'],
 		o: ['on', 'off'],
 		t: ['hidden', 'text', 'search', 'tel', 'url', 'email', 'password', 'datetime', 'date', 'month', 'week', 'time', 'datetime-local', 'number', 'range', 'color', 'checkbox', 'radio', 'file', 'submit', 'image', 'reset', 'button'],
 		im: ['verbatim', 'latin', 'latin-name', 'latin-prose', 'full-width-latin', 'kana', 'kana-name', 'katakana', 'numeric', 'tel', 'email', 'url'],