fix createCapture preview clipping

[aashu2006]

Resolves #1204

Adds Capture to the DOM check so createCapture() examples get extra preview height. Fixes the issue where the video was getting cut off below the canvas. Follows the same logic used for other DOM functions.

[aashu2006]

Hi @ksen0 . This was because createCapture wasn’t included in the DOM check, so the video was getting cut off below the canvas.

added it now and example 3 looks correct.

for the other examples:

• example 2 seems fine (video is hidden and drawn on canvas, just small)
• example 4 is norender, so not part of this

let me know if this looks good

[doradocodes]

@aashu2006 While I was testing your branch against the main and 2.0 branches, I noticed that Example 4 on that page is working differently:

A local version of the main branch with your change:

A local version of the 2.0 branch with your change:

I'm wondering why the preview window appears next the the code snippet for main but not 2.0. Is this something you've encountered?

[aashu2006]

@doradocodes yeah I checked this.

The preview is rendering in both cases, but the layout is different:

• main shows it side-by-side
• 2.0 stacks it above

I didn’t touch anything related to layout or preview positioning, the change only affects the height for createCapture.
So this seems to be a difference in layout behavior between the branches, not caused by this PR.

Let me know if you want me to look into that separately.