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Bojidar Marinov 81d90e1b0d fix: Fix invisible iframes with RENDER_CONTENT_MODE=iframe (#8378) 
b01dce2a6e added support for `RENDER_CONTENT_MODE=iframe` which used `onload="this.height=this.contentWindow.document.documentElement.scrollHeight"` to set the height of the iframe to the height of the embedded document.
Unfortunately, while this might have worked at some point, with `sandbox="allow-scripts"`, the document embedded in the iframe is counted as a cross-origin document, and browsers prevent any access to cross-origin documents.
[The solution](https://stackoverflow.com/questions/8223239/how-to-get-height-of-iframe-cross-domain) is to instead use `window.postMessage` to pass the height from the embedded document back to the embedding page.
Would appreciate a review of the privacy implications of this change—I feel it's probably "okay", but I'm not convinced my analysis is perfect.

Resolves #7586

Manual test:

1. Add the following snippet to your `app.ini`:
```ini
[markup.html]
ENABLED = true
FILE_EXTENSIONS = .html
RENDER_COMMAND = cat
RENDER_CONTENT_MODE = iframe
NEED_POSTPROCESS = false
```
2. Create a file in a repository with the name `test.html` and with the following contents:
```html
<!DOCTYPE html>

<html lang="en">
<head>
<meta charset="utf-8"/>
</head>
<body>
Hi from iframe!
Here is a random number: <script>document.write(Math.random())</script>.
</body>
</html>
```
3. Go to the file.
4. Observe the HTML is rendered and that the height is not larger than it needs to be (38 pixels).

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8378
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Bojidar Marinov <bojidar.marinov.bg@gmail.com>
Co-committed-by: Bojidar Marinov <bojidar.marinov.bg@gmail.com>
2025-09-06 16:23:01 +02:00
..
anchors.js Small refactors in anchors.js (#29947) 2024-03-26 19:04:27 +01:00
asciicast.js Fix math and mermaid rendering bugs (#24049) 2023-04-17 12:10:22 +02:00
codecopy.js Strip trailing newline in markdown code copy (#29019) 2024-02-01 15:01:48 -06:00
common.js Fix math and mermaid rendering bugs (#24049) 2023-04-17 12:10:22 +02:00
content.js fix: Fix invisible iframes with RENDER_CONTENT_MODE=iframe (#8378) 2025-09-06 16:23:01 +02:00
external.js fix: Fix invisible iframes with RENDER_CONTENT_MODE=iframe (#8378) 2025-09-06 16:23:01 +02:00
math.js chore: Update katex import path 2024-12-18 01:17:23 +01:00
mermaid.js Fix race condition in mermaid observer (#32599) 2024-12-03 10:19:22 +01:00
tasklist.js fix unchecking check boxes like [X] 2024-07-28 14:18:34 +00:00