Cannot use set_html with string longer than 1572834 characters on Windows about webview HOT 4 OPEN

Thanks for the report.

I checked the documentation of WebView2 and it states the following:

The htmlContent parameter may not be larger than 2 MB (2 * 1024 * 1024 bytes) in total size. The origin of the new page is about:blank.

1,572,834 characters is closer to 3 MB after conversion to UTF-16.

I suspect the only way around that is to navigate to a file, virtual hostname or with a custom URI scheme, but those need to be implemented in the library unless you use the native handles and do it yourself.

from webview.

Ah, thank you! I was searching for a documented limitation but couldn't find it.

from webview.

I know this is a different context, but I've recently been using QWebViewEngine (which is a Chomium wrapper) of the QT libraries. And, on the setHtml method documentation we read, “Content larger than 2 MB cannot be displayed, because setHtml() converts the provided HTML to percent-encoding and places data: in front of it to create the URL that it navigates to.”

https://doc.qt.io/qt-6/qwebengineview.html#setHtml

from webview.

I'm not quite sure exactly how the numbers add up to 2 MiB but here's my partial guess.

These numbers add up to 1572864 bytes or 1.5 MiB before conversion to UTF-16.

from webview.