fix(theme-classic): expose empty string alt text in navbar logos #7659

BenDMyers · 2022-06-22T16:33:27Z

Pre-flight checklist

I have read the Contributing Guidelines on pull requests.
If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

Resolves #7658

Allowing users to supply alt="" (distinct from no alt/undefined alt) for their navbar brand link logos can enable users to reduce clutter in screenreader announcements. However, as it currently stands, when an empty string is provided for a logo alt, Docusaurus falls back to the provided navbar title or the site title.

This pull request ensures that if a Docusaurus config provides alt: '' for a logo, that empty string is respected, so Docusaurus users can confidently mark their logos as decorative and reduce duplicated announcements.

Test Plan

Create a fresh Docusaurus site. In the Docusaurus config, update the navbar.logo.alt config to be an empty string. Build the site. Verify that the logo element has alt="" (may show up as simply alt in some browser devtools).

Navigate to the brand link with a screenreader. Verify that the screenreader only announces the site title once (from the visible site title label)

Test links

Choosing to dogfood on the main Docusaurus site's brand logo link:

Deploy preview: https://deploy-preview-7659--docusaurus-2.netlify.app/

Related issues/PRs

Resolves #7658

Prior art in #3352 (which addressed #3350) and #3817 (which addressed #3816)

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BenDMyers · 2022-06-22T16:35:31Z

@Josh-Cena Do you know of a good place to add unit tests for this sort of thing?

Josh-Cena · 2022-06-22T16:37:08Z

We don't have good unit testing infra for theme components yet, and since this is wired to the theme config, mocking the context is a bit tricky. Since there's already a dogfooding test (which I've always wanted to do anyway), I think that's not very critical.

Josh-Cena · 2022-06-22T16:40:25Z

packages/docusaurus-theme-classic/src/theme/Logo/index.tsx

@@ -32,7 +32,7 @@ export default function Logo(props: Props): JSX.Element {
      sources={sources}
      height={logo.height}
      width={logo.width}
-      alt={logo.alt || navbarTitle || title}
+      alt={logo.alt ?? (navbarTitle || title)}


What do you think about the case of alt: undefined and navbar: { title: "TypeScript ESLint" }? Should we use alt="" as well (sounds more sensible to me)?

I'm pretty much of the mindset that if any text appears in the same link as the logo, the logo should have alt="" - since at that point, the logo serves only to adorn that text.

Shall we use something closer to the line of logo.alt ?? (navbarTitle ? "" : title) then? (Plus a comment like "respect empty alt, don't show alt that's duplicated from navbar title")

Sure - I'll pull that out into its own declaration though, so that way it's not all inlined.

netlify · 2022-06-22T16:40:55Z

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github-actions · 2022-06-22T16:41:33Z

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 74	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 85	🟢 100	🟢 100	🟢 100	🟢 90	Report

netlify · 2022-06-22T16:45:29Z

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…llback

Josh-Cena · 2022-06-22T17:01:02Z

:/ Does this look right (alt instead of alt="")? I don't know if that's React's intended behavior.

BenDMyers · 2022-06-22T17:04:17Z

@Josh-Cena That's just how DevTools shows empty ~~alt texts~~ attributes in general - it's working as intended 🙂

Josh-Cena · 2022-06-22T17:35:20Z

Just pending CLA. I'll go to sleep and @slorber may merge it or I can merge it tomorrow morning (provided the CLA comes through at that time)

BenDMyers · 2022-06-22T17:37:00Z

I've submitted the CLA on my end - my "receipt":
Meta CLA.pdf

Might need some time to process on y'all's end - not sure how that works

Josh-Cena · 2022-06-22T17:39:50Z

Yes, it can easily take up to hours these days... We can just wait.

BenDMyers · 2022-06-22T17:40:17Z

No worries!

facebook-github-bot · 2022-06-22T18:33:56Z

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

Josh-Cena · 2022-06-23T03:42:43Z

Thanks! LGTM

BenDMyers added 2 commits June 22, 2022 11:13

fix: Expose empty string alt text in brand logos via nullish coalescing

840de25

fix: Update boolean logic for fallbacks

6568612

BenDMyers requested review from slorber, lex111 and Josh-Cena as code owners June 22, 2022 16:33

fix: Dogfood fix on Docusaurus brand logo

03cc4ae

Josh-Cena added the pr: bug fix This PR fixes a bug in a past release. label Jun 22, 2022

Josh-Cena changed the title ~~fix: Expose empty string alt text in navbar brand logos~~ fix: expose empty string alt text in navbar logos Jun 22, 2022

Josh-Cena reviewed Jun 22, 2022

View reviewed changes

refactor: Un-inline alt logic, and reduce chance of duplication in fa…

29df18e

…llback

Josh-Cena approved these changes Jun 22, 2022

View reviewed changes

BenDMyers mentioned this pull request Jun 22, 2022

Navbar logos not exposing empty alt text #7658

Closed

7 tasks

facebook-github-bot added the CLA Signed Signed Facebook CLA label Jun 22, 2022

Josh-Cena merged commit 3990404 into facebook:main Jun 23, 2022

Josh-Cena changed the title ~~fix: expose empty string alt text in navbar logos~~ fix(theme-classic): expose empty string alt text in navbar logos Jun 23, 2022

BenDMyers mentioned this pull request Jun 23, 2022

Docs: Navbar logo has extra decorative "TypeScript ESLint logo" narration typescript-eslint/typescript-eslint#5213

Closed

2 tasks

BenDMyers deleted the logo-empty-alt branch July 30, 2022 16:51

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fix(theme-classic): expose empty string alt text in navbar logos #7659

fix(theme-classic): expose empty string alt text in navbar logos #7659

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fix(theme-classic): expose empty string alt text in navbar logos #7659

fix(theme-classic): expose empty string alt text in navbar logos #7659

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BenDMyers commented Jun 22, 2022 • edited Loading

Pre-flight checklist

Motivation

Test Plan

Test links

Related issues/PRs

facebook-github-bot commented Jun 22, 2022

Action Required

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netlify bot commented Jun 22, 2022

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