[SR] Linear System - add screen reader support for Linear System interactive graph #2030

nishasy · 2024-12-18T22:04:10Z

Summary:

Add the aria label and descriptions for the full graph and the
interactive elements in the Linear System graph, based on the
SRUX doc.

Issue: https://khanacademy.atlassian.net/browse/LEMS-1727

Test plan:

yarn jest packages/perseus/src/widgets/interactive-graphs/graphs/linear-system.test.tsx

Storybook

http://localhost:6006/iframe.html?globals=&args=&id=perseuseditor-widgets-interactive-graph--interactive-graph-linear-system&viewMode=story

View Storybook publish in the checks below to try it yourself.

Screen.Recording.2024-12-18.at.2.04.53.PM.mov

The [SRUX doc](https://khanacademy.atlassian.net/wiki/spaces/LC/pages/3460366348/Linear) still needs a label for the grab handle, but I tried my best in the meantime. - Add a label and describedby for the grab handle. - Add aria-live states for the different interactive elements so they don't override each other. Issue: https://khanacademy.atlassian.net/browse/LEMS-1726 Test plan: `yarn jest packages/perseus/src/widgets/interactive-graphs/graphs/linear.test.tsx` Storybook - http://localhost:6006/iframe.html?id=perseuseditor-widgets-interactive-graph--interactive-graph-linear&viewMode=story - Try all the different slopes and intercepts - Move different elements and confirm that the updated aria-label is what is read out, and none of the other elements override the currently focused one.

…aria lives

…inear System interactive graph

github-actions · 2024-12-18T22:08:58Z

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (11f2a4a) and published it to npm. You
can install it using the tag PR2030.

Example:

yarn add @khanacademy/perseus@PR2030

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

./dev/tools/bump_perseus_version.sh -t PR2030

github-actions · 2024-12-18T22:09:20Z

Size Change: +683 B (+0.05%)

Total Size: 1.47 MB

Filename	Size	Change
`packages/perseus/dist/es/index.js`	412 kB	+596 B (+0.14%)
`packages/perseus/dist/es/strings.js`	4.91 kB	+87 B (+1.81%)

ℹ️ View Unchanged

Filename	Size
`packages/kas/dist/es/index.js`	39 kB
`packages/keypad-context/dist/es/index.js`	760 B
`packages/kmath/dist/es/index.js`	83.1 kB
`packages/math-input/dist/es/index.js`	78 kB
`packages/math-input/dist/es/strings.js`	1.79 kB
`packages/perseus-core/dist/es/index.js`	23.1 kB
`packages/perseus-editor/dist/es/index.js`	689 kB
`packages/perseus-linter/dist/es/index.js`	22.2 kB
`packages/perseus-score/dist/es/index.js`	103 kB
`packages/pure-markdown/dist/es/index.js`	3.66 kB
`packages/simple-markdown/dist/es/index.js`	12.5 kB

_{compressed-size-action}

nishasy · 2024-12-19T00:25:04Z

The parent pull-request (#2025) has been merged into main, but this branch (sr-linear-system) now has conflicts with the new base branch. These conflicts must be resolved before checks can complete on this pull-request.

catandthemachines

The experience is working for the individual points and lines, but I think we need to circle back and make sure it's working at the all up graph level.

catandthemachines · 2024-12-19T18:22:29Z

packages/perseus/src/widgets/interactive-graphs/graphs/linear-system.tsx

    return (
-        <>
+        <g
+            aria-label={strings.srLinearSystemGraph}


This aria-label is not getting read out when navigating to the whole graph. This is because the whole graph descriptions needs to happen at the mafs-graph.tsx level.

@nishasy , can you remind me of the resolution we decided on this? I remember we discussed this before the holidays.

I added the full graph description ("Interactive elements: ...") to this PR. You can see the commit below as "Add full graph description of all interactive elements" - 7d96885

benchristel · 2025-01-09T18:12:02Z

packages/perseus/src/strings.ts

@@ -478,6 +516,13 @@ export const strings: {
    srAngleGraphAriaLabel: "An angle on a coordinate plane.",
    srAngleGraphAriaDescription:
        "The angle measure is %(angleMeasure)s degrees with a vertex at %(vertexX)s comma %(vertexY)s, a point on the starting side at %(startingSideX)s comma %(startingSideY)s and a point on the ending side at %(endingSideX)s comma %(endingSideY)s",
+    srLinearSystemGraph: "Two lines on a coordinate plane.",
+    srLinearSystemPoints:
+        "Line %(lineSequence)s has two points, point 1 at %(point1X)s comma %(point1Y)s and point 2 at %(point2X)s comma %(point2Y)s.",


%(lineSequence)s made me think this is a placeholder for a description of a sequence of lines. Translators might find it confusing as well. I might prefer lineSequenceNumber or maybe just lineNumber.

Suggested change

"Line %(lineSequence)s has two points, point 1 at %(point1X)s comma %(point1Y)s and point 2 at %(point2X)s comma %(point2Y)s.",

"Line %(lineSequenceNumber)s has two points, point 1 at %(point1X)s comma %(point1Y)s and point 2 at %(point2X)s comma %(point2Y)s.",

benchristel · 2025-01-09T18:20:09Z

packages/perseus/src/widgets/interactive-graphs/graphs/linear-system.test.tsx

+        expect(linearSystemGraph).toBeInTheDocument();
+        expect(linearSystemGraph).toHaveAttribute(
+            "aria-describedby",
+            ":r1:-line1-points :r1:-line1-intercept :r1:-line1-slope :r1:-line2-points :r1:-line2-intercept :r1:-line2-slope",


I wish we could assert on the description text instead of the IDs of the description elements. That way we'd be testing what the user actually sees. If React Testing Library doesn't have any matchers for this (I didn't find any with a cursory search) maybe we should write our own. Then we could do something like:

expect(linearSystemGraph).toHaveAriaDescription("line 1 through 0 comma 0 and 5 comma 5 ...")

Our custom matchers for Jest are defined in config/test/custom-matchers.ts.

benchristel · 2025-01-09T18:23:46Z

packages/perseus/src/widgets/interactive-graphs/graphs/linear-system.test.tsx

+        test.each`
+            case                 | coords              | slopeDescription
+            ${"positive slope"}  | ${[[1, 1], [3, 3]]} | ${`Its slope increases from left to right.`}
+            ${"negative slope"}  | ${[[3, 3], [1, 6]]} | ${`Its slope decreases from left to right.`}


Maybe we should get a content creator to weigh in on this wording. Strictly speaking, I don't think the slope increases or decreases; the slope is constant and it's the y-coordinate that increases or decreases.

Maybe "Its slope is positive/negative/zero/undefined" would be a good way to phrase this? In any case, I'd defer to Charlie or Nick.

That's a good idea. Personally, I don't think that should be a blocker, I think we should update the wording when we do our strings pass before creating translation tickets.

benchristel · 2025-01-09T18:30:01Z

packages/perseus/src/widgets/interactive-graphs/graphs/linear-system.tsx

+            pointsDescriptionId: id + `-line${i + 1}-points`,
+            interceptDescriptionId: id + `-line${i + 1}-intercept`,
+            slopeDescriptionId: id + `-line${i + 1}-slope`,


Minor: as long as we're using a template string, we could include id in it too:

Suggested change

pointsDescriptionId: id + `-line${i + 1}-points`,

interceptDescriptionId: id + `-line${i + 1}-intercept`,

slopeDescriptionId: id + `-line${i + 1}-slope`,

pointsDescriptionId: `${id}-line${i + 1}-points`,

interceptDescriptionId: `${id}-line${i + 1}-intercept`,

slopeDescriptionId: `${id}-line${i + 1}-slope`,

benchristel · 2025-01-09T18:39:51Z

packages/perseus/src/widgets/interactive-graphs/graphs/linear-system.tsx

+                        <g
+                            key={slopeDescriptionId}
+                            id={slopeDescriptionId}
+                            style={{display: "hidden"}}


What is the purpose of display: hidden here? I don't think hidden is a valid value for display (MDN docs) and either display: none or visibility: hidden will hide the content from screenreaders.

I think we probably want to apply an srOnly set of styles here.

omg

Thank you for pointing this out!

I think this also means we can use innerText in the SR tree like you suggested rather than textContent.

@benchristel I just remembered why I tried to hide this from screen readers. I don't want these descriptions to something people can read out, it's just there for the other component to refer to. It would be really confusing if a screen reader user navigated to this part after the graph and then it started randomly reading these descriptions.

That being said... it doesn't seem like they're being read even after changing the style to a11y.srOnly - and this is even reflected in the SR tree. This is super confusing to me. I don't know why they're not being read after the graph.

benchristel · 2025-01-09T18:41:57Z

packages/perseus/src/widgets/interactive-graphs/graphs/linear.tsx

-              });
-    }
+    const slopeString = getSlopeStringForLine(line, strings);
+    const interceptString = getInterceptStringForLine(line, strings, locale);


👍 for refactoring this!

benchristel · 2025-01-09T18:44:39Z

packages/perseus/src/widgets/interactive-graphs/graphs/utils.ts

+
+export function getSlopeStringForLine(line: PairOfPoints, strings): string {
+    const slope = (line[1][1] - line[0][1]) / (line[1][0] - line[0][0]);
+    if (slope === Infinity || slope === -Infinity) {


FWIW, you could use Number.isFinite here:

Suggested change

if (slope === Infinity || slope === -Infinity) {

if (!Number.isFinite(slope)) {

That will also cause srLinearGraphSlopeVertical to be returned if the slope is NaN. (A slope of NaN shouldn't be possible, since we prevent the two control points of the line from having the same coordinates, so this is more paranoia than anything.)

benchristel · 2025-01-09T18:49:54Z

packages/perseus/src/widgets/interactive-graphs/graphs/utils.ts

+    const hasXIntercept = xIntercept !== Infinity && xIntercept !== -Infinity;
+    const hasYIntercept = yIntercept !== Infinity && yIntercept !== -Infinity;


Number.isFinite would be a nice simplification here, too. Actually, I think there's a bug that isFinite would fix, because NaN is a possibility here. E.g. if line[0][1] is 0 and the slope is also 0, the xIntercept will be NaN (since the line lies on the x-axis). Might be worth proving that with a test.

Suggested change

const hasXIntercept = xIntercept !== Infinity && xIntercept !== -Infinity;

const hasYIntercept = yIntercept !== Infinity && yIntercept !== -Infinity;

const hasXIntercept = Number.isFinite(xIntercept);

const hasYIntercept = Number.isFinite(yIntercept);

Oh hmm. You're right that the line crossing the x-axis causes it to be weird. Right now, it says it crosses the x-axis at [some number] comma 0, which isn't really correct.

I'll ask Caitlyn if we should add a custom string for that case, and same thing for Y axis.

anakaren-rojas · 2025-01-15T17:38:18Z

packages/perseus/src/widgets/interactive-graphs/graphs/linear-system.tsx

@@ -18,7 +23,9 @@ export function renderLinearSystemGraph(
 ): InteractiveGraphElementSuite {
    return {
        graph: <LinearSystemGraph graphState={state} dispatch={dispatch} />,
-        interactiveElementsDescription: null,
+        interactiveElementsDescription: (
+            <LinearSystemGraphDescription state={state} />


should all of our graphs be updating this?

@anakaren-rojas Yes! I went back and added it for Circle and Linear. We'll have to double check and make sure all the graphs have this.

anakaren-rojas · 2025-01-15T17:44:14Z

packages/perseus/src/widgets/interactive-graphs/graphs/linear-system.tsx

+function LinearSystemGraphDescription({
+    state,
+}: {
+    state: LinearSystemGraphState;
+}) {


a nit since I still don't quite understand the purpose of the destructuring that's happening here

Suggested change

function LinearSystemGraphDescription({

state,

}: {

state: LinearSystemGraphState;

}) {

function LinearSystemGraphDescription(

state: LinearSystemGraphState) {

This is a component! The {state} is the props. It needs to be like that because it gets called like <LinearSystemGraphDescription state={state} />.

Oh I seeee
There's an alternative way to declare functional components that might make the distinction between a FC and a regular function more apparent to the layman like me

type LinearSystemGraphDescriptionProps = { state: LinearSystemGraphState } const LinearSystemGraphDescription: React.FC<LinearSystemGraphDescriptionProps> =({state}) => {

anakaren-rojas · 2025-01-15T17:47:07Z

packages/perseus/src/widgets/interactive-graphs/graphs/utils.ts

@@ -62,3 +65,54 @@ export function getArrayWithoutDuplicates(array: Array<Coord>): Array<Coord> {

    return returnArray;
 }
+
+export function getSlopeStringForLine(line: PairOfPoints, strings): string {


can strings either be renamed to perseusStrings or the type added?

anakaren-rojas · 2025-01-15T17:48:56Z

packages/perseus/src/widgets/interactive-graphs/graphs/utils.ts

+export function getInterceptStringForLine(
+    line: PairOfPoints,
+    strings,
+    locale,


Suggested change

locale,

locale : string,

@handeyeco

This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## @khanacademy/perseus@51.0.0 ### Major Changes - [#2101](#2101) [`9cabe689a`](9cabe68) Thanks [@handeyeco](https://github.com/handeyeco)! - Move scorers and validators to `perseus-score` ### Minor Changes - [#2127](#2127) [`6f2813cfc`](6f2813c) Thanks [@benchristel](https://github.com/benchristel)! - Avoid adding undefined values to objects parsed from Perseus JSON when properties are missing. ### Patch Changes - [#2130](#2130) [`165305e11`](165305e) Thanks [@jeremywiebe](https://github.com/jeremywiebe)! - Change interactive-graph visual regression stories to Storybook's CSF v3 - [#2077](#2077) [`faccc2d59`](faccc2d) Thanks [@benchristel](https://github.com/benchristel)! - Internal: Enable the exhaustive test tool for parsePerseusItem to test articles. - [#2030](#2030) [`d96821e08`](d96821e) Thanks [@nishasy](https://github.com/nishasy)! - [SR] Linear System - add screen reader support for Linear System interactive graph - [#2036](#2036) [`0f8d11c0b`](0f8d11c) Thanks [@nishasy](https://github.com/nishasy)! - [SR] Ray graph - Add screen reader support for Ray interactive graph - [#2109](#2109) [`41ffd4a71`](41ffd4a) Thanks [@dependabot](https://github.com/apps/dependabot)! - Updating our wonder-blocks packages with the latest versions. - Updated dependencies \[[`9cabe689a`](9cabe68), [`41ffd4a71`](41ffd4a)]: - @khanacademy/kmath@0.3.0 - @khanacademy/perseus-core@3.2.0 - @khanacademy/perseus-score@1.1.0 - @khanacademy/math-input@22.2.1 - @khanacademy/kas@0.4.11 - @khanacademy/keypad-context@1.0.14 - @khanacademy/perseus-linter@1.2.13 - @khanacademy/pure-markdown@0.3.22 - @khanacademy/simple-markdown@0.13.15 ## @khanacademy/kmath@0.3.0 ### Minor Changes - [#2101](#2101) [`9cabe689a`](9cabe68) Thanks [@handeyeco](https://github.com/handeyeco)! - Move scorers and validators to `perseus-score` ### Patch Changes - Updated dependencies \[[`9cabe689a`](9cabe68)]: - @khanacademy/perseus-core@3.2.0 ## @khanacademy/perseus-core@3.2.0 ### Minor Changes - [#2101](#2101) [`9cabe689a`](9cabe68) Thanks [@handeyeco](https://github.com/handeyeco)! - Move scorers and validators to `perseus-score` ## @khanacademy/perseus-score@1.1.0 ### Minor Changes - [#2101](#2101) [`9cabe689a`](9cabe68) Thanks [@handeyeco](https://github.com/handeyeco)! - Move scorers and validators to `perseus-score` ### Patch Changes - Updated dependencies \[[`9cabe689a`](9cabe68)]: - @khanacademy/kmath@0.3.0 - @khanacademy/perseus-core@3.2.0 - @khanacademy/kas@0.4.11 ## @khanacademy/kas@0.4.11 ### Patch Changes - Updated dependencies \[[`9cabe689a`](9cabe68)]: - @khanacademy/perseus-core@3.2.0 ## @khanacademy/keypad-context@1.0.14 ### Patch Changes - Updated dependencies \[[`9cabe689a`](9cabe68)]: - @khanacademy/perseus-core@3.2.0 ## @khanacademy/math-input@22.2.1 ### Patch Changes - [#2101](#2101) [`9cabe689a`](9cabe68) Thanks [@handeyeco](https://github.com/handeyeco)! - Move scorers and validators to `perseus-score` - [#2109](#2109) [`41ffd4a71`](41ffd4a) Thanks [@dependabot](https://github.com/apps/dependabot)! - Updating our wonder-blocks packages with the latest versions. - Updated dependencies \[[`9cabe689a`](9cabe68)]: - @khanacademy/perseus-core@3.2.0 - @khanacademy/keypad-context@1.0.14 ## @khanacademy/perseus-editor@17.3.1 ### Patch Changes - [#2101](#2101) [`9cabe689a`](9cabe68) Thanks [@handeyeco](https://github.com/handeyeco)! - Move scorers and validators to `perseus-score` - [#2126](#2126) [`518b005f2`](518b005) Thanks [@benchristel](https://github.com/benchristel)! - Fix a React warning about non-unique component keys in the exercise editor. - [#2109](#2109) [`41ffd4a71`](41ffd4a) Thanks [@dependabot](https://github.com/apps/dependabot)! - Updating our wonder-blocks packages with the latest versions. - Updated dependencies \[[`165305e11`](165305e), [`6f2813cfc`](6f2813c), [`faccc2d59`](faccc2d), [`9cabe689a`](9cabe68), [`d96821e08`](d96821e), [`0f8d11c0b`](0f8d11c), [`41ffd4a71`](41ffd4a)]: - @khanacademy/perseus@51.0.0 - @khanacademy/kmath@0.3.0 - @khanacademy/perseus-core@3.2.0 - @khanacademy/perseus-score@1.1.0 - @khanacademy/math-input@22.2.1 - @khanacademy/kas@0.4.11 - @khanacademy/keypad-context@1.0.14 - @khanacademy/pure-markdown@0.3.22 ## @khanacademy/perseus-linter@1.2.13 ### Patch Changes - Updated dependencies \[[`9cabe689a`](9cabe68)]: - @khanacademy/perseus-core@3.2.0 ## @khanacademy/pure-markdown@0.3.22 ### Patch Changes - Updated dependencies \[[`9cabe689a`](9cabe68)]: - @khanacademy/perseus-core@3.2.0 - @khanacademy/simple-markdown@0.13.15 ## @khanacademy/simple-markdown@0.13.15 ### Patch Changes - Updated dependencies \[[`9cabe689a`](9cabe68)]: - @khanacademy/perseus-core@3.2.0 ## @khanacademy/perseus-dev-ui@5.1.1 ### Patch Changes - [#2101](#2101) [`9cabe689a`](9cabe68) Thanks [@handeyeco](https://github.com/handeyeco)! - Move scorers and validators to `perseus-score` - [#2109](#2109) [`41ffd4a71`](41ffd4a) Thanks [@dependabot](https://github.com/apps/dependabot)! - Updating our wonder-blocks packages with the latest versions. - Updated dependencies \[[`9cabe689a`](9cabe68), [`41ffd4a71`](41ffd4a)]: - @khanacademy/kmath@0.3.0 - @khanacademy/perseus-core@3.2.0 - @khanacademy/math-input@22.2.1 - @khanacademy/kas@0.4.11 - @khanacademy/perseus-linter@1.2.13 - @khanacademy/pure-markdown@0.3.22 - @khanacademy/simple-markdown@0.13.15 Author: khan-actions-bot Reviewers: jeremywiebe Required Reviewers: Approved By: jeremywiebe Checks: ⏭️ Publish npm snapshot, ✅ Check for .changeset entries for all changed files (ubuntu-latest, 20.x), ✅ Check builds for changes in size (ubuntu-latest, 20.x), ✅ Lint, Typecheck, Format, and Test (ubuntu-latest, 20.x), ✅ Cypress (ubuntu-latest, 20.x) Pull Request URL: #2117

nishasy added 5 commits December 17, 2024 17:04

docs(changeset): [SR] Linear graph - add grab handle description and …

586c962

…aria lives

Merge branch 'main' into sr-linear-body

ee8b9b2

Linear System SR

a5ef0f8

docs(changeset): [SR] Linear System - add screen reader support for L…

0fbbbfa

…inear System interactive graph

nishasy self-assigned this Dec 18, 2024

nishasy requested review from catandthemachines, anakaren-rojas and a team December 18, 2024 22:06

nishasy marked this pull request as ready for review December 18, 2024 22:10

Base automatically changed from sr-linear-body to main December 19, 2024 00:24

nishasy added 2 commits December 18, 2024 16:26

Merge branch 'main' into sr-linear-system

951fc96

fix misunderstanding from linear PR. update tests

193ee2a

catandthemachines requested changes Dec 19, 2024

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nishasy added 3 commits January 8, 2025 14:48

Merge branch 'main' into sr-linear-system

c01b4f6

remove contexts from strings

b315fbf

Add full graph description of all interactive elements

7d96885

nishasy requested review from catandthemachines and benchristel January 8, 2025 23:44

benchristel reviewed Jan 9, 2025

View reviewed changes

Rename lineSequence --> lineNumber

9ac9782

benchristel reviewed Jan 9, 2025

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nishasy added 5 commits January 9, 2025 13:01

Create custom matcher for aria descriptions

5b48e40

Include ID in template string

24f71a1

Use srOnly style instead of invalid display hidden

8669b75

use isFinite

ed8ccbd

Merge branch 'main' into sr-linear-system

4523ca0

nishasy added 3 commits January 14, 2025 21:55

handle SR for lines overlapping axes

f8c8c11

Use existing aria description matcher rather than creating a new one

1dcf3fd

correct string in test

d64ac0d

anakaren-rojas approved these changes Jan 15, 2025

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nishasy added 2 commits January 15, 2025 13:15

Add types

4468c3e

fix import

e4a7322

catandthemachines approved these changes Jan 15, 2025

View reviewed changes

Update grab handle description to match SRUX doc

11f2a4a

nishasy merged commit d96821e into main Jan 15, 2025
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nishasy deleted the sr-linear-system branch January 15, 2025 23:55

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[SR] Ray graph - Add screen reader support for Ray interactive graph #2036

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	"Line %(lineSequence)s has two points, point 1 at %(point1X)s comma %(point1Y)s and point 2 at %(point2X)s comma %(point2Y)s.",
	"Line %(lineSequenceNumber)s has two points, point 1 at %(point1X)s comma %(point1Y)s and point 2 at %(point2X)s comma %(point2Y)s.",

	if (slope === Infinity \|\| slope === -Infinity) {
	if (!Number.isFinite(slope)) {

		const hasXIntercept = xIntercept !== Infinity && xIntercept !== -Infinity;
		const hasYIntercept = yIntercept !== Infinity && yIntercept !== -Infinity;

[SR] Linear System - add screen reader support for Linear System interactive graph #2030

[SR] Linear System - add screen reader support for Linear System interactive graph #2030

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Summary:

Test plan:

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