HTML Streaming Setters

[nairnandu]

Description

This proposal aims to improve the interoperability of the built-in primitives for streaming:

HTML Enhanced Setter and Streaming Methods: Exposes a coherent set of HTML-setting methods to replace disjointed legacy APIs. The Setter methods are covered in #1416. This proposal includes streaming setter methods (streamHTML(), streamReplaceWithHTML(), streamBeforeHTML(), streamPrependHTML(), streamAppendHTML() and streamAfterHTML() DOM methods, and unsafe equivalents) alongside their *Unsafe variants.

Combined with <template for="…"> HTML element, these features give developers built-in, secure, and ergonomic mechanisms to dynamically update and stream DOM content.

Specification

whatwg/html#12758 (this PR should be merged in time for Interop)

web-feature

web-features: html-streaming-setters

Test Links

• domparsing

Additional Signals

• Standards Positions: 
  • Firefox has signaled "Positive" for revamped DOM parsing methods (mozilla/standards-positions#1370). 
  • WebKit position is pending (WebKit/standards-positions#629).
• Developer Sentiment: Web developers have consistently requested a way to stream content into an element (WHATWG issue #2142) and improve insertAdjacent*() methods (WHATWG issue #10122) (source).

[github-actions]

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Below is additional information about the web feature (from the web-features project) which is referenced in your proposal.
If this doesn't accurately correspond to your proposal, please update your initial comment to include web-features: <feature-id>.
To find feature IDs, use the web-features explorer.

Feature HTML streaming setters

• ID: html-streaming-setters
• Name: HTML streaming setters
• Description: The streamHTML(), streamReplaceWithHTML(), streamBeforeHTML(), streamPrependHTML(), streamAppendHTML() and streamAfterHTML() DOM methods, and unsafe equivalents, return writeable streams that incrementally insert HTML into an existing tree.
• Baseline status: Limited Availability
• Docs: Blob: textStream() method, Request: textStream() method, Response: textStream() method
• Developer signals: 1 votes (details)
• WPT tests: wpt.fyi results
• More information: See the web-features explorer

[o-t-w]

This is a duplicate of #1366

[nairnandu]

Thanks @o-t-w! Updated the proposal scope to streaming setters