gatsbyjs · tyhopp · Jan 19, 2023 · Jan 12, 2023 · Jan 17, 2023 · Jan 17, 2023
diff --git a/.../development-runtime/cypress/integration/head-function-export/html-and-body-attributes.js b/.../development-runtime/cypress/integration/head-function-export/html-and-body-attributes.js
@@ -0,0 +1,50 @@
+import headFunctionExportSharedData from "../../../shared-data/head-function-export.js"
+
+describe(`Html and body attributes`, () => {
+  it(`Page has body and html attributes on direct visit`, () => {
+    cy.visit(
+      headFunctionExportSharedData.page.htmlAndBodyAttributes
+    ).waitForRouteChange()
+
+    cy.get(`body`).should(`have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`have.attr`, `lang`, `fr`)
+  })
+
+  it(`Page has body and html attributes on client-side navigation`, () => {
+    cy.visit(headFunctionExportSharedData.page.basic).waitForRouteChange()
+
+    cy.get(`body`).should(`not.have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`not.have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`not.have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`not.have.attr`, `lang`, `fr`)
+
+    cy.visit(
+      headFunctionExportSharedData.page.htmlAndBodyAttributes
+    ).waitForRouteChange()
+
+    cy.get(`body`).should(`have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`have.attr`, `lang`, `fr`)
+  })
+
+  it(`Body and html attributes are removed on client-side navigation when new page doesn't set them`, () => {
+    cy.visit(
+      headFunctionExportSharedData.page.htmlAndBodyAttributes
+    ).waitForRouteChange()
+
+    cy.get(`body`).should(`have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`have.attr`, `lang`, `fr`)
+
+    cy.visit(headFunctionExportSharedData.page.basic).waitForRouteChange()
+
+    cy.get(`body`).should(`not.have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`not.have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`not.have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`not.have.attr`, `lang`, `fr`)
+  })
+})
diff --git a/e2e-tests/development-runtime/shared-data/head-function-export.js b/e2e-tests/development-runtime/shared-data/head-function-export.js
@@ -12,6 +12,7 @@ const page = {
   invalidElements: `${path}/invalid-elements/`,
   fsRouteApi: `${path}/fs-route-api/`,
   deduplication: `${path}/deduplication/`,
+  htmlAndBodyAttributes: `${path}/html-and-body-attributes/`,
 }
 
 const data = {
@@ -23,7 +24,7 @@ const data = {
     style: `rebeccapurple`,
     link: `/used-by-head-function-export-basic.css`,
     extraMeta: `Extra meta tag that should be removed during navigation`,
-    jsonLD: `{"@context":"https://schema.org","@type":"Organization","url":"https://www.spookytech.com","name":"Spookytechnologies","contactPoint":{"@type":"ContactPoint","telephone":"+5-601-785-8543","contactType":"CustomerSupport"}}`
+    jsonLD: `{"@context":"https://schema.org","@type":"Organization","url":"https://www.spookytech.com","name":"Spookytechnologies","contactPoint":{"@type":"ContactPoint","telephone":"+5-601-785-8543","contactType":"CustomerSupport"}}`,
   },
   queried: {
     base: `http://localhost:8000`,

diff --git a/e2e-tests/development-runtime/src/pages/head-function-export/html-and-body-attributes.js b/e2e-tests/development-runtime/src/pages/head-function-export/html-and-body-attributes.js
@@ -0,0 +1,28 @@
+import * as React from "react"
+
+export default function HeadFunctionHtmlAndBodyAttributes() {
+  return (
+    <>
+      <h1>I have html and body attributes</h1>
+    </>
+  )
+}
+
+function Indirection({ children }) {
+  return (
+    <>
+      <html lang="fr" />
+      <body className="foo" />
+      {children}
+    </>
+  )
+}
+
+export function Head() {
+  return (
+    <Indirection>
+      <html data-foo="bar" />
+      <body data-foo="baz" />
+    </Indirection>
+  )
+}
diff --git a/...s/production-runtime/cypress/integration/head-function-export/html-and-body-attributes.js b/...s/production-runtime/cypress/integration/head-function-export/html-and-body-attributes.js
@@ -0,0 +1,61 @@
+import headFunctionExportSharedData from "../../../shared-data/head-function-export.js"
+
+Cypress.on("uncaught:exception", err => {
+  if (
+    (err.message.includes("Minified React error #418") ||
+      err.message.includes("Minified React error #423") ||
+      err.message.includes("Minified React error #425")) &&
+    Cypress.env(`TEST_PLUGIN_OFFLINE`)
+  ) {
+    return false
+  }
+})
+
+describe(`Html and body attributes`, () => {
+  it(`Page has body and html attributes on direct visit`, () => {
+    cy.visit(
+      headFunctionExportSharedData.page.htmlAndBodyAttributes
+    ).waitForRouteChange()
+
+    cy.get(`body`).should(`have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`have.attr`, `lang`, `fr`)
+  })
+
+  it(`Page has body and html attributes on client-side navigation`, () => {
+    cy.visit(headFunctionExportSharedData.page.basic).waitForRouteChange()
+
+    cy.get(`body`).should(`not.have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`not.have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`not.have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`not.have.attr`, `lang`, `fr`)
+
+    cy.visit(
+      headFunctionExportSharedData.page.htmlAndBodyAttributes
+    ).waitForRouteChange()
+
+    cy.get(`body`).should(`have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`have.attr`, `lang`, `fr`)
+  })
+
+  it(`Body and html attributes are removed on client-side navigation when new page doesn't set them`, () => {
+    cy.visit(
+      headFunctionExportSharedData.page.htmlAndBodyAttributes
+    ).waitForRouteChange()
+
+    cy.get(`body`).should(`have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`have.attr`, `lang`, `fr`)
+
+    cy.visit(headFunctionExportSharedData.page.basic).waitForRouteChange()
+
+    cy.get(`body`).should(`not.have.attr`, `data-foo`, `baz`)
+    cy.get(`body`).should(`not.have.attr`, `class`, `foo`)
+    cy.get(`html`).should(`not.have.attr`, `data-foo`, `bar`)
+    cy.get(`html`).should(`not.have.attr`, `lang`, `fr`)
+  })
+})
diff --git a/e2e-tests/production-runtime/cypress/integration/head-function-export/html-insertion.js b/e2e-tests/production-runtime/cypress/integration/head-function-export/html-insertion.js
@@ -1,5 +1,16 @@
 import { page, data } from "../../../shared-data/head-function-export.js"
 
+Cypress.on("uncaught:exception", err => {
+  if (
+    (err.message.includes("Minified React error #418") ||
+      err.message.includes("Minified React error #423") ||
+      err.message.includes("Minified React error #425")) &&
+    Cypress.env(`TEST_PLUGIN_OFFLINE`)
+  ) {
+    return false
+  }
+})
+
 describe(`Head function export html insertion`, () => {
   it(`should work with static data`, () => {
     cy.visit(page.basic).waitForRouteChange()

diff --git a/e2e-tests/production-runtime/shared-data/head-function-export.js b/e2e-tests/production-runtime/shared-data/head-function-export.js
@@ -13,6 +13,7 @@ const page = {
   fsRouteApi: `${path}/fs-route-api/`,
   deduplication: `${path}/deduplication/`,
   pageWithUseLocation: `${path}/page-with-uselocation/`,
+  htmlAndBodyAttributes: `${path}/html-and-body-attributes/`,
 }
 
 const data = {
@@ -24,7 +25,7 @@ const data = {
     style: `rebeccapurple`,
     link: `/used-by-head-function-export-basic.css`,
     extraMeta: `Extra meta tag that should be removed during navigation`,
-    jsonLD: `{"@context":"https://schema.org","@type":"Organization","url":"https://www.spookytech.com","name":"Spookytechnologies","contactPoint":{"@type":"ContactPoint","telephone":"+5-601-785-8543","contactType":"CustomerSupport"}}`
+    jsonLD: `{"@context":"https://schema.org","@type":"Organization","url":"https://www.spookytech.com","name":"Spookytechnologies","contactPoint":{"@type":"ContactPoint","telephone":"+5-601-785-8543","contactType":"CustomerSupport"}}`,
   },
   queried: {
     base: `http://localhost:9000`,

diff --git a/e2e-tests/production-runtime/src/pages/head-function-export/html-and-body-attributes.js b/e2e-tests/production-runtime/src/pages/head-function-export/html-and-body-attributes.js
@@ -0,0 +1,28 @@
+import * as React from "react"
+
+export default function HeadFunctionHtmlAndBodyAttributes() {
+  return (
+    <>
+      <h1>I have html and body attributes</h1>
+    </>
+  )
+}
+
+function Indirection({ children }) {
+  return (
+    <>
+      <html lang="fr" />
+      <body className="foo" />
+      {children}
+    </>
+  )
+}
+
+export function Head() {
+  return (
+    <Indirection>
+      <html data-foo="bar" />
+      <body data-foo="baz" />
+    </Indirection>
+  )
+}
diff --git a/integration-tests/head-function-export/__tests__/ssr-html-output.js b/integration-tests/head-function-export/__tests__/ssr-html-output.js
@@ -105,4 +105,24 @@ describe(`Head function export SSR'ed HTML output`, () => {
     // alternate links are not using id, so should have multiple instances
     expect(dom.querySelectorAll(`link[rel=alternate]`)?.length).toEqual(2)
   })
+
+  it(`should allow setting html and body attributes`, () => {
+    const html = readFileSync(
+      `${publicDir}${page.bodyAndHtmlAttributes}/index.html`
+    )
+    const dom = parse(html)
+    expect(dom.querySelector(`html`).attributes).toMatchInlineSnapshot(`
+      {
+        "data-foo": "bar",
+        "lang": "fr",
+      }
+    `)
+
+    expect(dom.querySelector(`body`).attributes).toMatchInlineSnapshot(`
+      {
+        "class": "foo",
+        "data-foo": "baz",
+      }
+    `)
+  })
 })
diff --git a/integration-tests/head-function-export/shared-data/head-function-export.js b/integration-tests/head-function-export/shared-data/head-function-export.js
@@ -8,6 +8,7 @@ const page = {
   warnings: `${path}/warnings/`,
   allProps: `${path}/all-props/`,
   deduplication: `${path}/deduplication/`,
+  bodyAndHtmlAttributes: `${path}/html-and-body-attributes/`,
 }
 
 const data = {

diff --git a/...ion-tests/head-function-export/src/pages/head-function-export/html-and-body-attributes.js b/...ion-tests/head-function-export/src/pages/head-function-export/html-and-body-attributes.js
@@ -0,0 +1,28 @@
+import * as React from "react"
+
+export default function HeadFunctionHtmlAndBodyAttributes() {
+  return (
+    <>
+      <h1>I have html and body attributes</h1>
+    </>
+  )
+}
+
+function Indirection({ children }) {
+  return (
+    <>
+      <html lang="fr" />
+      <body className="foo" />
+      {children}
+    </>
+  )
+}
+
+export function Head() {
+  return (
+    <Indirection>
+      <html data-foo="bar" />
+      <body data-foo="baz" />
+    </Indirection>
+  )
+}
diff --git a/integration-tests/ssr/__tests__/ssr.js b/integration-tests/ssr/__tests__/ssr.js
@@ -64,6 +64,24 @@ describe(`SSR`, () => {
     const ssrHead = ssrDom.querySelector(`[data-testid=title]`)
 
     expect(devSsrHead.textContent).toEqual(ssrHead.textContent)
+    expect(devSsrDom.querySelector(`html`).attributes).toEqual(
+      ssrDom.querySelector(`html`).attributes
+    )
+    expect(devSsrDom.querySelector(`html`).attributes).toMatchInlineSnapshot(`
+      Object {
+        "data-foo": "bar",
+        "lang": "fr",
+      }
+    `)
+
+    expect(devSsrDom.querySelector(`body`).attributes).toEqual(
+      ssrDom.querySelector(`body`).attributes
+    )
+    expect(devSsrDom.querySelector(`body`).attributes).toMatchInlineSnapshot(`
+      Object {
+        "data-foo": "baz",
+      }
+    `)
   })
 
   describe(`it generates an error page correctly`, () => {

diff --git a/integration-tests/ssr/src/pages/head-function-export.js b/integration-tests/ssr/src/pages/head-function-export.js
@@ -5,5 +5,11 @@ export default function PageWithHeadFunctionExport() {
 }
 
 export function Head() {
-  return <title data-testid="title">Hello world</title>
+  return (
+    <>
+      <html lang="fr" data-foo="bar" />
+      <body data-foo="baz" />
+      <title data-testid="title">Hello world</title>
+    </>
+  )
 }
diff --git a/packages/gatsby/cache-dir/head/constants.js b/packages/gatsby/cache-dir/head/constants.js
@@ -6,4 +6,6 @@ export const VALID_NODE_NAMES = [
   `base`,
   `noscript`,
   `script`,
+  `html`,
+  `body`,
 ]