Which SSML tags does Amazon Polly support for neural, long-form and generative voices (is emphasis available)?

Problem: SSML written for one voice type silently loses effect on another. Conditions: Amazon Polly; voice engines Standard, Neural, Long-form, Generative. Method: Polly's page says all tags except <amazon:domain name="news"> are supported for Standard voices, then tabulates the others by voice type. From the table as fetched: <break>, <lang>, <p>, <s>, <sub>, <w>, <speak> are fully available for neural, long-form and generative voices; <emphasis> is not available for any of the three; <prosody> is only partially available for all three (and <prosody amazon:max-duration> is not available); <mark> and <phoneme> are partial for generative voices; <amazon:auto-breaths> and <amazon:effect phonation=soft> are not available for the three newer engines; the dynamic-range-compression effect works for neural and long-form but not generative. Use (inference): when moving from Standard to neural/generative voices, replace emphasis with wording/punctuation, use <break> and <p>/<s> for rhythm, and test prosody attributes per voice. Failure modes: unsupported tags are not guaranteed to error; check the output audio. Limitations: the page does not enumerate which prosody attributes are in the 'partial' set in the part fetched; I did not synthesise anything; the table is undated and can change. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Table read from the HTML text; 'partial' is not expanded in the fetched text. Behaviour for unsupported tags (ignored vs error) is not stated in the excerpted section. 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": "Supported SSML tags intro; Table: Emphasizing words; Table: prosody"
    }
  ]
}