测试：按实际可见文字校验列表对比度

tests/review-list-density.e2e.test.mjs

@@ -138,7 +138,6 @@ async function measure(page) {
         gap: style.gap,
         padding: style.padding,
         background: style.backgroundColor,
-        color: style.color,
         weight: style.fontWeight,
         fontSize: style.fontSize,
         shadow: style.boxShadow,
@@ -239,6 +238,29 @@ for (const [name, routePath, kind, visibleText] of pages) {
               .locator(".p-datatable-mask")
               .waitFor({ state: "hidden" });
             const filled = await measure(page);
+            const visible = content
+              .getByText(visibleText, { exact: true })
+              .first();
+            assert.equal(await visible.isVisible(), true);
+            // 容器可能没有直接绘制文字；对比度应取可见业务文字及其实际承载背景。
+            filled.text = await visible.evaluate((element) => {
+              const rgb = (color) => color.match(/[\d.]+/g).map(Number);
+              const layers = [];
+              for (let owner = element; owner; owner = owner.parentElement)
+                layers.push(rgb(getComputedStyle(owner).backgroundColor));
+              let background = [255, 255, 255];
+              for (const layer of layers.reverse()) {
+                const alpha = layer[3] ?? 1;
+                background = background.map(
+                  (channel, index) =>
+                    channel * (1 - alpha) + layer[index] * alpha,
+                );
+              }
+              return {
+                color: getComputedStyle(element).color,
+                background: `rgb(${background.join(", ")})`,
+              };
+            });
             const violations = [];
             for (const [stateName, observed] of [
               ["empty", empty],
@@ -290,22 +312,16 @@ for (const [name, routePath, kind, visibleText] of pages) {
             }
             const surface = kind === "table" ? filled.table : filled.article;
             const background = luminance(surface.background);
-            const foreground = luminance(surface.color);
+            const textBackground = luminance(filled.text.background);
+            const foreground = luminance(filled.text.color);
             if (theme === "light" ? background < 0.5 : background > 0.1)
               violations.push("filled: surface ignores theme");
             if (
-              (Math.max(background, foreground) + 0.05) /
-                (Math.min(background, foreground) + 0.05) <
+              (Math.max(textBackground, foreground) + 0.05) /
+                (Math.min(textBackground, foreground) + 0.05) <
               4.5
             )
               violations.push("filled: unreadable theme contrast");
-            assert.equal(
-              await content
-                .getByText(visibleText, { exact: true })
-                .first()
-                .isVisible(),
-              true,
-            );
             assert.deepEqual(violations, [], JSON.stringify({ empty, filled }));
             return { routePath, width, theme, kind, empty, filled };
           }),