This context names image states and transitions handled by progressive-picture.
Picture: A responsive image made from source candidates and fallback image content. Avoid: image service, gallery
Preview: A lower-quality image shown while its high-resolution image is being prepared. Avoid: placeholder, thumbnail
High-resolution image: The image promoted after successful loading, replacing the preview state. Avoid: full image, final asset
Active source: Source candidate selected by browser responsive-image rules for current rendering conditions. Avoid: first source, preferred source
Progressive loading: Transition from preview to high-resolution image after high-resolution content loads successfully. Avoid: image upgrade, lazy image load
Forced loading: Progressive loading triggered directly instead of waiting for viewport visibility. Avoid: eager loading, bypass loading