🐞 fix: Update Chrome tint implementation for iOS 26+ compatibility and enhance test coverage

2026-07-12 14:12:18 -05:00
parent ca367364f8
commit a41f6f3834
2 changed files with 88 additions and 41 deletions
@@ -3,14 +3,21 @@ import { expect, test } from "@playwright/test";
 /**
 * Chrome tint behavior:
 *
- *   - Top tint (status bar / notch / Dynamic Island):
+ *   - Top tint (status bar / notch / Dynamic Island) — iOS ≤18 / Chrome:
 *     <meta name="theme-color"> = HEADER_COLOR when the site header is
 *     in view; cleared (no content) otherwise.
 *
+ *   - Top tint — iOS 26+ (where the meta tag is ignored):
+ *     document.body.style.backgroundColor is set to the same color.
+ *     WebKit's live observer picks up body background changes and tints
+ *     the chrome to match.
+ *
 *   - Bottom tint (home indicator area, behind the address bar):
 *     <body class="footer-in-view"> when the site footer is in view;
 *     absent otherwise. The CSS body::after pseudo-element picks up
- *     the footer color from this class.
+ *     the footer color from this class. (iOS 26 only samples one color
+ *     for the entire chrome, so the top and bottom share a color on
+ *     iOS 26; the pseudo-element is a no-op fallback there.)
 *
 * Tests run against the local Herd site.
 */
@@ -45,7 +52,7 @@ test.describe("chrome tint", () => {
        expect(viewport).toContain("viewport-fit=cover");
    });

-    test("top tint is set when header is in view at page top", async ({
+    test("theme-color meta is set when header is in view at page top", async ({
        page,
    }) => {
        await page.goto(site, { waitUntil: "networkidle" });
@@ -64,11 +71,10 @@ test.describe("chrome tint", () => {
        expect(content).toBe(HEADER_COLOR);
    });

-    test("top tint clears when neither header nor footer is in view", async ({
+    test("theme-color meta clears when header scrolls out of view", async ({
        page,
    }) => {
        await page.goto(site, { waitUntil: "networkidle" });
-        // Wait for the initial intersection observation to apply.
        await page.waitForFunction(
            (expected) => {
                const meta = document.querySelector('meta[name="theme-color"]');
@@ -77,24 +83,51 @@ test.describe("chrome tint", () => {
            HEADER_COLOR,
            { timeout: 2000 },
        );
-        // Scroll down so the header is out of view and the footer is not yet visible.
        await page.evaluate(() => window.scrollTo(0, 1200));
-        // Give the IntersectionObserver a tick to fire.
        await page.waitForTimeout(300);
        const content = await page.evaluate(() => {
            const meta = document.querySelector('meta[name="theme-color"]');
            return meta ? meta.getAttribute("content") : null;
        });
-        // When the header is out of view, the top tint should be cleared
-        // (no content attribute) so iOS falls back to the page background.
        expect(content).toBeNull();
    });

+    test("body background is set to header color when header is in view (iOS 26 path)", async ({
+        page,
+    }) => {
+        await page.goto(site, { waitUntil: "networkidle" });
+        // Wait for ChromeTint.js to set the body background.
+        await page.waitForFunction(
+            () => document.body.style.backgroundColor !== "",
+            { timeout: 2000 },
+        );
+        const bg = await page.evaluate(() => document.body.style.backgroundColor);
+        // The browser normalizes hex to rgb() — accept either form.
+        // #032F46 = rgb(3, 47, 70) (with sRGB rounding)
+        expect(bg).toMatch(/^#?032[Ff]46$|^rgb\(\s*3,\s*4[67],\s*70\s*\)$/);
+    });
+
+    test("body background clears when header scrolls out of view", async ({
+        page,
+    }) => {
+        await page.goto(site, { waitUntil: "networkidle" });
+        await page.waitForFunction(
+            () => document.body.style.backgroundColor !== "",
+            { timeout: 2000 },
+        );
+        await page.evaluate(() => window.scrollTo(0, 1200));
+        await page.waitForFunction(
+            () => document.body.style.backgroundColor === "",
+            { timeout: 2000 },
+        );
+        const bg = await page.evaluate(() => document.body.style.backgroundColor);
+        expect(bg).toBe("");
+    });
+
    test("bottom tint class is absent when footer is out of view", async ({
        page,
    }) => {
        await page.goto(site, { waitUntil: "networkidle" });
-        // At page top, the footer is not in view.
        await page.waitForTimeout(200);
        const hasClass = await page.evaluate(() =>
            document.body.classList.contains("footer-in-view"),
@@ -106,11 +139,9 @@ test.describe("chrome tint", () => {
        page,
    }) => {
        await page.goto(site, { waitUntil: "networkidle" });
-        // Scroll to the very bottom of the page.
        await page.evaluate(() =>
            window.scrollTo(0, document.documentElement.scrollHeight),
        );
-        // Wait for the IntersectionObserver to fire.
        await page.waitForFunction(
            () => document.body.classList.contains("footer-in-view"),
            { timeout: 2000 },
@@ -125,7 +156,6 @@ test.describe("chrome tint", () => {
        page,
    }) => {
        await page.goto(site, { waitUntil: "networkidle" });
-        // Scroll to bottom first.
        await page.evaluate(() =>
            window.scrollTo(0, document.documentElement.scrollHeight),
        );
@@ -133,7 +163,6 @@ test.describe("chrome tint", () => {
            () => document.body.classList.contains("footer-in-view"),
            { timeout: 2000 },
        );
-        // Scroll back up.
        await page.evaluate(() => window.scrollTo(0, 0));
        await page.waitForFunction(
            () => !document.body.classList.contains("footer-in-view"),
@@ -149,13 +178,7 @@ test.describe("chrome tint", () => {
        page,
    }) => {
        await page.goto(site, { waitUntil: "networkidle" });
-        // Verify the body::after pseudo-element has the right CSS
-        // (env(safe-area-inset-bottom) resolves to 0 on most desktops,
-        // so we just check that the rule is present and references the
-        // expected values).
        const css = await page.evaluate(() => {
-            // We can't read pseudo-elements directly, but we can check
-            // the stylesheet for the rules.
            for (const sheet of Array.from(document.styleSheets)) {
                try {
                    for (const rule of Array.from(sheet.cssRules)) {
@@ -173,3 +196,4 @@ test.describe("chrome tint", () => {
        expect(css).toContain("position: fixed");
    });
 });
+