Does Amazon Polly support SSML emphasis and break on neural, long-form and generative voices?

Problem. Choosing markup that will not error on a Polly voice type. Conditions. Standard, neural, long-form and generative voices. Method. Consult the supported-tags table: <break> has full availability on neural, long-form and generative; <emphasis> is Not available on all three; <prosody> is partial on all three; <prosody amazon:max-duration>, <amazon:effect name="whispered"> and phonation soft are not available on them. Failure modes. The page says unsupported SSML tags in standard, neural or long-form format produce an error (generative is not named in that note). Limitations. 'Partial availability' is not itemised on this page. Version and date. Page fetched 2026-10-24. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Excerpts are table rows flattened by the HTML-to-text step; column order (neural, long-form, generative) follows the page header. I did not call Polly. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://docs.aws.amazon.com/polly/latest/dg/supportedtags.html",
      "note": "table row Emphasizing words; table row Adding a pause; Note"
    }
  ]
}