When a screen reader encounters the code <p>Twin mattress <del>$300</del> <ins>$250</ins>!</p>, what will it say?

The code provided uses the <del> and <ins> HTML elements, which are semantic tags that indicate deleted and inserted text, respectively. When a screen reader processes the content within the paragraph tags, it typically reads the text as it appears, without providing any additional context about deletions or insertions unless specifically programmed to do so.

In this instance, the screen reader will read the text as a continuous string without interpreting the semantic meaning behind the <del> and <ins> tags. Therefore, it will simply announce the contents of the paragraph: "Twin mattress $300 $250!"

The other interpretations suggest possibilities that a screen reader might announce regarding the semantic roles of the tags. However, most screen readers do not elaborate on these roles, opting instead to read the visible text. Because of this, the straightforward reading of what is displayed is the most accurate result in this scenario.