Capture stages
A capture is a chain: a clone freezes the live DOM, a render turns it into pixels. A plugin declares how far the chain runs:
// Clone only, no image
{ name: 'my-plugin', needs: 'clone' }
// Complete capture (the default)
{ name: 'my-plugin' }v3 removed a third stage, needs: 'dom', which ran against the live page
with no clone. Declaring it throws.
A capture runs to the deepest stage its plugins declare; one undeclared plugin keeps the whole chain. No plugins, no change.
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What the numbers say
The clone stage skips asset embedding and serialization. The saving depends on the page; no stage promises a fixed fraction of a full capture.
Unavailable exports
Asking a clone-stage capture for pixels throws, naming the plugin that lowered the stage. Re-capturing on demand would return a different instant, unnoticed by the caller.