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W-PROGRAM-TITLE-NESTED

A documentary attribute on a nested <program> has no effect.

Warning Compile-time SPEC §4.12.9 (normative)

What it means

A nested <program> declares a worker. Workers have no DOM and therefore no <head>, so documentary attributes like title= have nowhere to land. The attribute is silently inert at runtime, which is exactly the kind of thing worth a warning — the author clearly expected it to do something.

Minimal reproducer

This is the exact source compiled against the linked compiler and verified to produce W-PROGRAM-TITLE-NESTED. 

<program title="outer">
    <program title="inner" #compute>
        when message(data) { send(data) }
    </>
    <p>x</p>
</>

How to fix

  1. Move the attribute to the top-level <program>. That is the one with a document head.
  2. Remove it. If the nested program is a worker and needed no title, the attribute was a copy-paste artefact.

Related

Specification

Normative text: §4.12.9, §40.7, §34. Spec lives at compiler/SPEC.md .

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