fix(runtime-dom): consistently remove boolean attributes for falsy values (#4348)

packages/compiler-ssr/src/transforms/ssrTransformElement.ts

@@ -43,7 +43,8 @@ import {
   SSR_RENDER_DYNAMIC_ATTR,
   SSR_RENDER_ATTRS,
   SSR_INTERPOLATE,
-  SSR_GET_DYNAMIC_MODEL_PROPS
+  SSR_GET_DYNAMIC_MODEL_PROPS,
+  SSR_INCLUDE_BOOLEAN_ATTR
 } from '../runtimeHelpers'
 import { SSRTransformContext, processChildren } from '../ssrCodegenTransform'
 
@@ -237,7 +238,10 @@ export const ssrTransformElement: NodeTransform = (node, context) => {
                   if (isBooleanAttr(attrName)) {
                     openTag.push(
                       createConditionalExpression(
-                        value,
+                        createCallExpression(
+                          context.helper(SSR_INCLUDE_BOOLEAN_ATTR),
+                          [value]
+                        ),
                         createSimpleExpression(' ' + attrName, true),
                         createSimpleExpression('', true),
                         false /* no newline */