fix(runtime-dom/ssr): properly handle xlink and boolean attributes

packages/runtime-dom/src/modules/attrs.ts

@@ -1,4 +1,6 @@
-// TODO explain why we are no longer checking boolean/enumerated here
+import { isSpecialBooleanAttr } from '@vue/shared'
+
+const xlinkNS = 'http://www.w3.org/1999/xlink'
 
 export function patchAttr(
   el: Element,
@@ -7,12 +9,19 @@ export function patchAttr(
   isSVG: boolean
 ) {
   if (isSVG && key.indexOf('xlink:') === 0) {
-    // TODO handle xlink
+    if (value == null) {
-  } else if (value == null) {
+      el.removeAttributeNS(xlinkNS, key)
-    el.removeAttribute(key)
+    } else {
+      el.setAttributeNS(xlinkNS, key, value)
+    }
   } else {
-    // TODO in dev mode, warn against incorrect values for boolean or
+    // note we are only checking boolean attributes that don't have a
-    // enumerated attributes
+    // correspoding dom prop of the same name here.
-    el.setAttribute(key, value)
+    const isBoolean = isSpecialBooleanAttr(key)
+    if (value == null || (isBoolean && value === false)) {
+      el.removeAttribute(key)
+    } else {
+      el.setAttribute(key, isBoolean ? '' : value)
+    }
   }
 }

packages/server-renderer/src/renderProps.ts

@@ -30,7 +30,9 @@ export function renderProps(
         ? key
         : propsToAttrMap[key] || key.toLowerCase()
       if (isBooleanAttr(attrKey)) {
-        ret += ` ${attrKey}=""`
+        if (value !== false) {
+          ret += ` ${attrKey}`
+        }
       } else if (isSSRSafeAttrName(attrKey)) {
         ret += ` ${attrKey}="${escape(value)}"`
       }

packages/shared/src/domAttrConfig.ts

@@ -1,18 +1,23 @@
 import { makeMap } from './makeMap'
 
-// TODO validate this list!
+// On the client we only need to offer special cases for boolean attributes that
-// on the client, most of these probably has corresponding prop
+// have different names from their corresponding dom properties:
-// or, like allowFullscreen on iframe, although case is different, the attr
+// - itemscope -> N/A
-// affects the property properly...
+// - allowfullscreen -> allowFullscreen
-// Basically, we can skip this check on the client
+// - formnovalidate -> formNoValidate
-// but they are still needed during SSR to produce correct initial markup
+// - ismap -> isMap
-export const isBooleanAttr = makeMap(
+// - nomodule -> noModule
-  'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
+// - novalidate -> noValidate
-    'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
+// - readonly -> readOnly
-    'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
+const specialBooleanAttrs = `itemscope,allowfullscreen,formnovalidate,ismap,nomodule,novalidate,readonly`
-    'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
+export const isSpecialBooleanAttr = /*#__PURE__*/ makeMap(specialBooleanAttrs)
-    'required,reversed,scoped,seamless,selected,sortable,translate,' +
+
-    'truespeed,typemustmatch,visible'
+// The full list is needed during SSR to produce the correct initial markup.
+export const isBooleanAttr = /*#__PURE__*/ makeMap(
+  specialBooleanAttrs +
+    `,async,autofocus,autoplay,controls,default,defer,disabled,hidden,ismap,` +
+    `loop,nomodule,open,required,reversed,scoped,seamless,` +
+    `checked,muted,multiple,selected`
 )
 
 const unsafeAttrCharRE = /[>/="'\u0009\u000a\u000c\u0020]/
@@ -37,7 +42,7 @@ export const propsToAttrMap: Record<string, string | undefined> = {
 }
 
 // CSS properties that accept plain numbers
-export const isNoUnitNumericStyleProp = makeMap(
+export const isNoUnitNumericStyleProp = /*#__PURE__*/ makeMap(
   `animation-iteration-count,border-image-outset,border-image-slice,` +
     `border-image-width,box-flex,box-flex-group,box-ordinal-group,column-count,` +
     `columns,flex,flex-grow,flex-positive,flex-shrink,flex-negative,flex-order,` +