[🐛 Bug]: Headless Chrome - New Windows Open in Incorrect (Compressed) Size

[SuravinS]

Description

When using headless Chrome mode via Selenium, any new windows or tabs opened during test execution (e.g., via window.open() or by clicking a link with target="_blank") are opened in a compressed or smaller than expected size, even though the window-size argument is passed correctly in Chrome options.

Reproducible Code

Environment:

Selenium Version: [4.31.0]

Chrome Version: [138.0.7204.158]

Chromedriver Version: [138.0.7204.157]

OS: [Windows 11]

Language: C#

Execution Mode: Headless


`else if (browser.Equals("hchrome", StringComparison.OrdinalIgnoreCase))
                {
                    IsHeadless = true;  // headless
                    ChromeOptions options = new ChromeOptions();
                    options.AddArgument("--headless");
                    if (isIncognito) options.AddArgument("--incognito");
                    options.AddArgument("--disable-extensions");
                    options.AddArgument("--disable-gpu");
                    options.AddArgument("--no-sandbox");
                    options.AddArgument("window-size=1920,1080");
                    options.AddArgument("disable-features=DownloadBubble,DownloadBubbleV2");
                    options.AddUserProfilePreference("download.default_directory", downloadDir);
                    options.AddUserProfilePreference("disable-popup-blocking", "true");
                    options.AddUserProfilePreference("download.prompt_for_download", false);
                    options.AddUserProfilePreference("profile.default_content_setting_values.automatic_downloads", 1);
                    options.AddUserProfilePreference("credentials_enable_service", false);
                    options.AddUserProfilePreference("profile.password_manager_enabled", false);

                    new DriverManager().SetUpDriver(new ChromeConfig());
                    Drivers.Value = new ChromeDriver(options);
                }`

---

ℹ️ Last known working version: 4.16.2

[selenium-ci]

@SuravinS, thank you for creating this issue. We will troubleshoot it as soon as we can.

Selenium Triage Team: remember to follow the Triage Guide

[github-actions]

⚠️ You reported using Selenium version 4.31.0, but the latest release is 4.34.

Please verify that this issue still occurs with the latest version. If it no longer applies, you can close this issue or update your comment.

This issue will be marked "awaiting answer" and may be closed automatically if no response is received.

[VietND96]

Refer to this for window-size in headless mode #15854 (comment)