diff --git a/frontend-modern/src/components/shared/__tests__/HistoryChart.test.tsx b/frontend-modern/src/components/shared/__tests__/HistoryChart.test.tsx
index fc4ba20ff..19aa1eb53 100644
--- a/frontend-modern/src/components/shared/__tests__/HistoryChart.test.tsx
+++ b/frontend-modern/src/components/shared/__tests__/HistoryChart.test.tsx
@@ -150,7 +150,7 @@ describe('HistoryChart', () => {
     const canvas = screen.getByRole('img', { name: 'History chart' });
     const announcement = container.querySelector('[aria-live="polite"]')!;
     expect(canvas).toHaveAttribute('tabindex', '0');
-    expect(announcement).toBeEmptyDOMElement();
+    expect(announcement.textContent).toBe('');
     fireEvent.focus(canvas);
     expect(announcement).toHaveTextContent('30.0%');
     fireEvent.keyDown(canvas, { key: 'ArrowLeft' });
@@ -164,20 +164,20 @@ describe('HistoryChart', () => {
     fireEvent.keyDown(canvas, { key: 'ArrowRight' });
     expect(announcement).toHaveTextContent('30.0%');
     fireEvent.keyDown(canvas, { key: 'Escape' });
-    expect(announcement).toBeEmptyDOMElement();
+    expect(announcement.textContent).toBe('');
     expect(container.querySelector('[data-history-chart-tooltip]')).toBeNull();
     fireEvent.keyDown(canvas, { key: 'Home' });
     setPoints(points().map((point) => ({ ...point, value: point.value + 1 })));
     expect(announcement).toHaveTextContent('11.0%');
     setTarget('b');
-    expect(announcement).toBeEmptyDOMElement();
+    expect(announcement.textContent).toBe('');
     fireEvent.keyDown(canvas, { key: 'Home' });
     fireEvent.blur(canvas);
-    expect(announcement).toBeEmptyDOMElement();
+    expect(announcement.textContent).toBe('');
     setPoints([]);
     fireEvent.focus(canvas);
     fireEvent.keyDown(canvas, { key: 'End' });
-    expect(announcement).toBeEmptyDOMElement();
+    expect(announcement.textContent).toBe('');
   });
 
   it('renders the default history label', () => {
diff --git a/frontend-modern/src/components/shared/__tests__/historyChartModel.branchcov2.test.ts b/frontend-modern/src/components/shared/__tests__/historyChartModel.branchcov2.test.ts
index a5f6bda04..76f4c1c49 100644
--- a/frontend-modern/src/components/shared/__tests__/historyChartModel.branchcov2.test.ts
+++ b/frontend-modern/src/components/shared/__tests__/historyChartModel.branchcov2.test.ts
@@ -496,7 +496,7 @@ describe('getHistoryChartTooltipLayout', () => {
       chartHeight: 180,
     });
 
-    expect(layout).toStrictEqual({ x: 162, y: 47, width: 156, height: 46 });
+    expect(layout).toStrictEqual({ x: 162, y: 38, width: 156, height: 64 });
   });
 
   it('places the tooltip to the left when only the left side has room', () => {
@@ -537,7 +537,7 @@ describe('getHistoryChartTooltipLayout', () => {
       chartHeight: 180,
     });
 
-    expect(layout).toStrictEqual({ x: 12, y: 12, width: 156, height: 46 });
+    expect(layout).toStrictEqual({ x: 12, y: 82, width: 156, height: 64 });
   });
 
   it('pushes an overlapping tooltip above the hovered point when there is headroom above', () => {
@@ -558,6 +558,6 @@ describe('getHistoryChartTooltipLayout', () => {
       chartHeight: 180,
     });
 
-    expect(layout.y).toBe(126);
+    expect(layout.y + layout.height).toBe(172);
   });
 });