Links (Block base class)
PageBlockCalloutBlockDividerBlockHeading1BlockLinkPreviewBlockPdfBlockTemplateBlock (Deprecated)ToggleHeading2Block
DatabaseBookmarkBlockCodeBlockEmbedBlockHeading2BlockLinkToPageBlockQuoteBlockToDoBlockToggleHeading3Block
1. Class methods
self.new → BreadcrumbBlock
self.new creates a BreadcrumbBlock object.b = BreadcrumbBlock.new; b.block_json # => {"type"=>"breadcrumb", "breadcrumb"=>{}}