core(meta-elements): add NodeDetails

lighthouse-core/audits/seo/is-crawlable.js

@@ -105,7 +105,7 @@ class IsCrawlable extends Audit {
           if (isBlocking) {
             blockingDirectives.push({
               source: {
-                type: /** @type {'node'} */ ('node'),
+                ...Audit.makeNodeItem(metaRobots.node),
                 snippet: `<meta name="robots" content="${metaRobotsContent}" />`,
               },
             });

lighthouse-core/gather/gatherers/meta-elements.js

@@ -8,12 +8,18 @@
 const FRGatherer = require('../../fraggle-rock/gather/base-gatherer.js');
 const pageFunctions = require('../../lib/page-functions.js');
 
-/* globals getElementsInDocument */
+/* globals getElementsInDocument getNodeDetails */
 
 /* c8 ignore start */
 function collectMetaElements() {
-  // @ts-expect-error - getElementsInDocument put into scope via stringification
-  const metas = /** @type {HTMLMetaElement[]} */ (getElementsInDocument('head meta'));
+  const functions = /** @type {typeof pageFunctions} */({
+    // @ts-expect-error - getElementsInDocument put into scope via stringification
+    getElementsInDocument,
+    // @ts-expect-error - getNodeDetails put into scope via stringification
+    getNodeDetails,
+  });
+
+  const metas = functions.getElementsInDocument('head meta');
   return metas.map(meta => {
     /** @param {string} name */
     const getAttribute = name => {
@@ -27,6 +33,7 @@ function collectMetaElements() {
       property: getAttribute('property'),
       httpEquiv: meta.httpEquiv ? meta.httpEquiv.toLowerCase() : undefined,
       charset: getAttribute('charset'),
+      node: functions.getNodeDetails(meta),
     };
   });
 }
@@ -50,7 +57,10 @@ class MetaElements extends FRGatherer {
     return driver.executionContext.evaluate(collectMetaElements, {
       args: [],
       useIsolation: true,
-      deps: [pageFunctions.getElementsInDocument],
+      deps: [
+        pageFunctions.getElementsInDocument,
+        pageFunctions.getNodeDetailsString,
+      ],
     });
   }
 }

lighthouse-core/lib/asset-saver.js

@@ -117,7 +117,7 @@ async function saveArtifacts(artifacts, basePath) {
   }
 
   // save everything else, using a replacer to serialize LHErrors in the artifacts.
-  const restArtifactsString = JSON.stringify(restArtifacts, stringifyReplacer, 2);
+  const restArtifactsString = JSON.stringify(restArtifacts, stringifyReplacer, 2) + '\n';
   fs.writeFileSync(`${basePath}/${artifactsFilename}`, restArtifactsString, 'utf8');
   log.log('Artifacts saved to disk in folder:', basePath);
   log.timeEnd(status);

lighthouse-core/test/audits/seo/is-crawlable-test.js

@@ -12,7 +12,7 @@ const networkRecordsToDevtoolsLog = require('../../network-records-to-devtools-l
 /* eslint-env jest */
 
 describe('SEO: Is page crawlable audit', () => {
-  const makeMetaElements = content => [{name: 'robots', content}];
+  const makeMetaElements = content => [{name: 'robots', content, node: {}}];
 
   it('fails when page is blocked from indexing with a robots metatag', () => {
     const robotsValues = [
@@ -323,6 +323,11 @@ describe('SEO: Is page crawlable audit', () => {
         Array [
           Object {
             "source": Object {
+              "boundingRect": undefined,
+              "lhId": undefined,
+              "nodeLabel": undefined,
+              "path": undefined,
+              "selector": undefined,
               "snippet": "<meta name=\\"robots\\" content=\\"noindex\\" />",
               "type": "node",
             },

lighthouse-core/test/results/artifacts/artifacts.json

@@ -711,16 +711,62 @@
   "MetaElements": [
     {
       "name": "",
-      "content": ""
+      "content": "",
+      "charset": "utf-8",
+      "node": {
+        "lhId": "5-22-META",
+        "devtoolsNodePath": "3,HTML,0,HEAD,1,META",
+        "selector": "head > meta",
+        "boundingRect": {
+          "top": 0,
+          "bottom": 0,
+          "left": 0,
+          "right": 0,
+          "width": 0,
+          "height": 0
+        },
+        "snippet": "<meta charset=\"utf-8\">",
+        "nodeLabel": "meta"
+      }
     },
     {
       "name": "viewport",
-      "content": "width=device-width, initial-scale=1, minimum-scale=1"
+      "content": "width=device-width, initial-scale=1, minimum-scale=1",
+      "node": {
+        "lhId": "5-23-META",
+        "devtoolsNodePath": "3,HTML,0,HEAD,2,META",
+        "selector": "head > meta",
+        "boundingRect": {
+          "top": 0,
+          "bottom": 0,
+          "left": 0,
+          "right": 0,
+          "width": 0,
+          "height": 0
+        },
+        "snippet": "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1, minimum-scale=1\">",
+        "nodeLabel": "meta"
+      }
     },
     {
       "name": "",
       "content": "Open Graph smoke test description",
-      "property": "og:description"
+      "property": "og:description",
+      "node": {
+        "lhId": "5-24-META",
+        "devtoolsNodePath": "3,HTML,0,HEAD,3,META",
+        "selector": "head > meta",
+        "boundingRect": {
+          "top": 0,
+          "bottom": 0,
+          "left": 0,
+          "right": 0,
+          "width": 0,
+          "height": 0
+        },
+        "snippet": "<meta property=\"og:description\" content=\"Open Graph smoke test description\">",
+        "nodeLabel": "meta"
+      }
     }
   ],
   "ConsoleMessages": [

lighthouse-core/test/results/sample_v2.json

@@ -4056,9 +4056,9 @@
     },
     "charset": {
       "id": "charset",
-      "title": "Charset declaration is missing or occurs too late in the HTML",
+      "title": "Properly defines charset",
       "description": "A character encoding declaration is required. It can be done with a `<meta>` tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header. [Learn more](https://web.dev/charset/).",
-      "score": 0,
+      "score": 1,
       "scoreDisplayMode": "binary"
     },
     "dom-size": {
@@ -5564,7 +5564,7 @@
         }
       ],
       "id": "best-practices",
-      "score": 0.13
+      "score": 0.19
     },
     "seo": {
       "title": "SEO",
@@ -8227,7 +8227,7 @@
       "lighthouse-core/audits/dobetterweb/doctype.js | description": [
         "audits.doctype.description"
       ],
-      "lighthouse-core/audits/dobetterweb/charset.js | failureTitle": [
+      "lighthouse-core/audits/dobetterweb/charset.js | title": [
         "audits.charset.title"
       ],
       "lighthouse-core/audits/dobetterweb/charset.js | description": [

types/artifacts.d.ts

@@ -115,7 +115,7 @@ declare global {
       /** All the link elements on the page or equivalently declared in `Link` headers. @see https://html.spec.whatwg.org/multipage/links.html */
       LinkElements: Artifacts.LinkElement[];
       /** The values of the <meta> elements in the head. */
-      MetaElements: Array<{name?: string, content?: string, property?: string, httpEquiv?: string, charset?: string}>;
+      MetaElements: Array<{name?: string, content?: string, property?: string, httpEquiv?: string, charset?: string, node: LH.Artifacts.NodeDetails}>;
       /** Information on all script elements in the page. Also contains the content of all requested scripts and the networkRecord requestId that contained their content. Note, HTML documents will have one entry per script tag, all with the same requestId. */
       ScriptElements: Array<Artifacts.ScriptElement>;
       /** The dimensions and devicePixelRatio of the loaded viewport. */