Add upstream

wp-content/plugins/jetpack/modules/sso/jetpack-sso-login.js

@@ -0,0 +1,32 @@
+jQuery( document ).ready( function( $ ) {
+	var body = $( 'body' ),
+		toggleSSO = $( '.jetpack-sso-toggle' ),
+		userLogin = $( '#user_login' ),
+		ssoWrap = $( '#jetpack-sso-wrap' ),
+		loginForm = $( '#loginform' ),
+		overflow = $( '<div class="jetpack-sso-clear"></div>' );
+
+	// The overflow div is a poor man's clearfloat. We reposition the remember me
+	// checkbox and the submit button within that to clear the float on the
+	// remember me checkbox. This is important since we're positioning the SSO
+	// UI under the submit button.
+	//
+	// @TODO: Remove this approach once core ticket 28528 is in and we have more actions in wp-login.php.
+	// See - https://core.trac.wordpress.org/ticket/28528
+	loginForm.append( overflow );
+	overflow.append( $( 'p.forgetmenot' ), $( 'p.submit' ) );
+
+	// We reposition the SSO UI at the bottom of the login form which
+	// fixes a tab order issue. Then we override any styles for absolute
+	// positioning of the SSO UI.
+	loginForm.append( ssoWrap );
+	body.addClass( 'jetpack-sso-repositioned' );
+
+	toggleSSO.on( 'click', function( e ) {
+		e.preventDefault();
+		body.toggleClass( 'jetpack-sso-form-display' );
+		if ( ! body.hasClass( 'jetpack-sso-form-display' ) ) {
+			userLogin.focus();
+		}
+	} );
+} );