MicrosoftEdge / MicrosoftEdge/WebView2Feedback

Margins doesn't work in print function

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bug priority-low tracked
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Description

Description
We want to use the print function in WebView2, the Version of Webview2 is 1.0.1108.44. We try to print HTML to PDF. Our expectation is that the image starting from top left without any spaces. Therefore, we try to set the margins in the CoreWebView2PrintSettings, but it seems like no effect on the final result

Version
Nuget Package: 1.0.1108.44
Runtime: 98.0.1108.56
Framework: WPF
OS: Win10

Repro Steps

private async void InitializeAsync()
{
    WebViewTest.NavigationCompleted += WebView_NavigationCompleted;
    await WebViewTest.EnsureCoreWebView2Async(null);
    WebViewEnvironment = await Microsoft.Web.WebView2.Core.CoreWebView2Environment.CreateAsync().ConfigureAwait(true);
}

private async void WebView_NavigationCompleted(object sender, Microsoft.Web.WebView2.Core.CoreWebView2NavigationCompletedEventArgs e)
{
    //WebViewTest.CoreWebView2.ExecuteScriptAsync("window.print();");        
    CoreWebView2PrintSettings lPrintSettings = WebViewEnvironment.CreatePrintSettings();
    lPrintSettings.MarginBottom = 0;
    lPrintSettings.MarginLeft = 0;
    lPrintSettings.MarginRight = 0;
    lPrintSettings.MarginTop = 0;
    lPrintSettings.ShouldPrintBackgrounds = true;
    lPrintSettings.ShouldPrintHeaderAndFooter = false;
    lPrintSettings.ShouldPrintSelectionOnly = false;
    await WebViewTest.CoreWebView2.PrintToPdfAsync(PathPDF, lPrintSettings);
}

and then we get the result, it still contains a lot of spaces on the top and right sides

The expected print result is print with
WebViewTest.CoreWebView2.ExecuteScriptAsync("window.print();");

It uses windows print, and margins could be set to None, and image starts from top left.

Additional context
Could you please help us to solve this problem, maybe we have set something wrong? Thank you in advance!

AB#38378170

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the WPF repro in InitializeAsync and WebView_NavigationCompleted, focusing on PrintToPdfAsync and CoreWebView2PrintSettings. Compare its zero-margin configuration with the window.print() path described in the issue and verify the generated PDF behavior. Done means determining whether the settings should remove the whitespace and documenting the supported result or required guidance.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
30/100

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