WIP: Expression w/ Label POC

[handeyeco]

Summary:

Desktop:

Mobile:

Issue: LEMS-2114

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to packages/perseus/src/components/math-input.tsx, packages/perseus/src/styles/perseus-renderer.less, packages/perseus/src/widgets/expression.tsx, packages/math-input/src/components/input/math-input.tsx, packages/perseus/src/widgets/__stories__/expression.stories.tsx, packages/perseus/src/widgets/__testdata__/expression.testdata.ts

---

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[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (45e0506) and published it to npm. You
can install it using the tag PR1378.

Example:

yarn add @khanacademy/perseus@PR1378

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR1378

[github-actions]

Size Change: +394 B (+0.05%)

Total Size: 847 kB

Filename	Size	Change
packages/math-input/dist/es/index.js	80.1 kB	-5 B (-0.01%)
packages/perseus/dist/es/index.js	408 kB	+399 B (+0.1%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.2 kB
packages/kmath/dist/es/index.js	4.26 kB
packages/math-input/dist/es/strings.js	1.73 kB
packages/perseus-core/dist/es/index.js	906 B
packages/perseus-editor/dist/es/index.js	272 kB
packages/perseus-error/dist/es/index.js	866 B
packages/perseus-linter/dist/es/index.js	21.8 kB
packages/perseus/dist/es/strings.js	3.21 kB
packages/pure-markdown/dist/es/index.js	3.67 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[anakaren-rojas]

General question: where is the best place to get test data like this?

[handeyeco]

I'll DM you (I'm always a little hesitant to post links to internal tools on GH).

[handeyeco]

Closing in favor of #1404