feat(html reporter): open html attachments in new tab (#32389)

Closes https://github.com/microsoft/playwright/issues/32281.

HTML attachments get a linkified name that opens the attachment in a new
tab.

packages/html-reporter/src/links.tsx

@@ -75,11 +75,16 @@ export const AttachmentLink: React.FunctionComponent<{
   attachment: TestAttachment,
   href?: string,
   linkName?: string,
-}> = ({ attachment, href, linkName }) => {
+  openInNewTab?: boolean,
+}> = ({ attachment, href, linkName, openInNewTab }) => {
   return <TreeItem title={<span>
     {attachment.contentType === kMissingContentType ? icons.warning() : icons.attachment()}
     {attachment.path && <a href={href || attachment.path} download={downloadFileNameForAttachment(attachment)}>{linkName || attachment.name}</a>}
-    {!attachment.path && <span>{linkifyText(attachment.name)}</span>}
+    {!attachment.path && (
+      openInNewTab
+        ? <a href={URL.createObjectURL(new Blob([attachment.body!], { type: attachment.contentType }))} target='_blank' rel='noreferrer' onClick={e => e.stopPropagation()}>{attachment.name}</a>
+        : <span>{linkifyText(attachment.name)}</span>
+    )}
   </span>} loadChildren={attachment.body ? () => {
     return [<div key={1} className='attachment-body'><CopyToClipboard value={attachment.body!}/>{linkifyText(attachment.body!)}</div>];
   } : undefined} depth={0} style={{ lineHeight: '32px' }}></TreeItem>;

packages/html-reporter/src/testResultView.tsx

@@ -67,15 +67,16 @@ export const TestResultView: React.FC<{
   anchor: 'video' | 'diff' | '',
 }> = ({ result, anchor }) => {
 
-  const { screenshots, videos, traces, otherAttachments, diffs } = React.useMemo(() => {
+  const { screenshots, videos, traces, otherAttachments, diffs, htmls } = React.useMemo(() => {
     const attachments = result?.attachments || [];
     const screenshots = new Set(attachments.filter(a => a.contentType.startsWith('image/')));
     const videos = attachments.filter(a => a.name === 'video');
     const traces = attachments.filter(a => a.name === 'trace');
+    const htmls = attachments.filter(a => a.contentType.startsWith('text/html'));
     const otherAttachments = new Set<TestAttachment>(attachments);
-    [...screenshots, ...videos, ...traces].forEach(a => otherAttachments.delete(a));
+    [...screenshots, ...videos, ...traces, ...htmls].forEach(a => otherAttachments.delete(a));
     const diffs = groupImageDiffs(screenshots);
-    return { screenshots: [...screenshots], videos, traces, otherAttachments, diffs };
+    return { screenshots: [...screenshots], videos, traces, otherAttachments, diffs, htmls };
   }, [result]);
 
   const videoRef = React.useRef<HTMLDivElement>(null);
@@ -135,7 +136,10 @@ export const TestResultView: React.FC<{
       </div>)}
     </AutoChip>}
 
-    {!!otherAttachments.size && <AutoChip header='Attachments'>
+    {!!(otherAttachments.size + htmls.length) && <AutoChip header='Attachments'>
+      {[...htmls].map((a, i) => (
+        <AttachmentLink key={`html-link-${i}`} attachment={a} openInNewTab />)
+      )}
       {[...otherAttachments].map((a, i) => <AttachmentLink key={`attachment-link-${i}`} attachment={a}></AttachmentLink>)}
     </AutoChip>}
   </div>;

tests/playwright-test/reporter-html.spec.ts

@@ -802,6 +802,32 @@ for (const useIntermediateMergeReport of [false] as const) {
       await expect(page.locator('.attachment-body')).toHaveText(['foo', '{"foo":1}', 'utf16 encoded']);
     });
 
+    test('should have link for opening HTML attachments in new tab', async ({ runInlineTest, page, showReport }) => {
+      const result = await runInlineTest({
+        'a.test.js': `
+          import { test, expect } from '@playwright/test';
+          test('passing', async ({ page }, testInfo) => {
+            testInfo.attach('axe-report.html', {
+              contentType: 'text/html',
+              body: '<h1>Axe Report</h1>',
+            });
+          });
+        `,
+      }, { reporter: 'dot,html' }, { PLAYWRIGHT_HTML_OPEN: 'never' });
+      expect(result.exitCode).toBe(0);
+
+      await showReport();
+      await page.getByText('passing', { exact: true }).click();
+
+      const [newTab] = await Promise.all([
+        page.waitForEvent('popup'),
+        page.getByText('axe-report.html', { exact: true }).click(),
+      ]);
+
+      await expect(newTab).toHaveURL(/^blob:/);
+      await expect(newTab.getByText('Axe Report')).toBeVisible();
+    });
+
     test('should use file-browser friendly extensions for buffer attachments based on contentType', async ({ runInlineTest, showReport, page }, testInfo) => {
       const result = await runInlineTest({
         'a.test.js': `