low-perry

This clears the confusion presented at Issue [#661](https://github.com/mdn/learning-area/issues/661#issue-1860236275). ```JavaScript //line1 guesses.textContent = `${guesses.textContent} ${userGuess}`; //line2 guesses.textContent += userGuess + ' '; ``` The code below line 1 is presented on...

On [chapter 3 , shadowing section](https://github.com/rust-lang/book/blob/main/src/ch03-01-variables-and-mutability.md) the text goes to great lengths to explain the difference between mutability and shadowing, somewhat implying that you can have either/or (not stated anywhere)....

Align `getCapabilities()` documentation with JavaScript runtime behavior

2

### Description As pointed out by [#38249](https://github.com/mdn/content/issues/38249) the objects presented as the properties of the return value of the [`getCapabilities()`](https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamTrack/getCapabilities#return_value), method were wrong. I removed that abstraction all together and...

Add missing MediaSource event pages

1

### Description This PR addresses the absence of [MediaSource](https://developer.mozilla.org/en-US/docs/Web/API/MediaSource) event documentation.

This PR updates the copy-to-clipboard functionality in our code blocks. The previous implementation used the now‑deprecated `document.execCommand('copy')` per [MDN guidance](https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand). To modernize our approach and ensure future compatibility, we've replaced...