grafana/k6 · error

bringing page to front: %w

Error message

bringing page to front: %w

What it means

Page.BringToFront executes the CDP Page.bringToFront command and wraps any protocol-level failure. The command activates the browser tab for this page; it fails when the target no longer accepts commands (closed/crashed tab) or the CDP session is detached.

Source

Thrown at internal/js/modules/k6/browser/common/page.go:913

	}

	return nil
}

func (p *Page) viewportSize() Size {
	return Size{
		Width:  float64(p.emulatedSize.Viewport.Width),
		Height: float64(p.emulatedSize.Viewport.Height),
	}
}

// BringToFront activates the browser tab for this page.
func (p *Page) BringToFront() error {
	p.logger.Debugf("Page:BringToFront", "sid:%v", p.sessionID())

	action := page.BringToFront()
	if err := action.Do(cdp.WithExecutor(p.ctx, p.session)); err != nil {
		return fmt.Errorf("bringing page to front: %w", err)
	}

	return nil
}

// SetChecked sets the checked state of the element matching the provided selector.
func (p *Page) SetChecked(selector string, checked bool, popts *FrameCheckOptions) error {
	p.logger.Debugf("Page:SetChecked", "sid:%v selector:%s checked:%t", p.sessionID(), selector, checked)

	return p.MainFrame().SetChecked(selector, checked, popts)
}

// Check checks an element matching the provided selector.
func (p *Page) Check(selector string, popts *FrameCheckOptions) error {
	p.logger.Debugf("Page:Check", "sid:%v selector:%s", p.sessionID(), selector)

	return p.MainFrame().Check(selector, popts)
}

View on GitHub (pinned to 93accf6570)

Solutions

1. Check page.isClosed() before calling bringToFront()
2. Re-acquire the page handle (newPage) instead of reusing one from a previous iteration
3. Confirm the browser process is still alive (check for earlier errors in the log)
4. Drop the call if the tab activation is not required for the test logic

Example fix

// before
await page.close();
await page.bringToFront(); // session already gone

// after
if (!page.isClosed()) {
  await page.bringToFront();
}

if (!page.isClosed()) await page.bringToFront();

try { await page.bringToFront(); } catch (e) { if (!/bringing page to front/.test(e.message)) throw e; }

When it happens

Trigger: page.bringToFront() after the tab was closed manually or programmatically, after a browser crash, or while the page's session is being torn down at test end.

Common situations: Calling bringToFront() on a stale page handle reused across iterations; headless environments where the target was already destroyed; scripts that close pages early then continue interacting.

Related errors

• setting emulated vision deficiency %q: %w
• WebSocket endpoint cannot be empty
• can't fetch the page for unknown reason
• errorText
• parent frame has been detached

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/fcbf47a2fe256bca. Report an issue: GitHub.