Preço certo, prazo antigo: como conferir as transições de uma proposta em HTML

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Uma proposta interativa pode mostrar o preço certo e, ao mesmo tempo, manter o prazo da opção anterior. É fácil não perceber isso quando cada botão é conferido separadamente. Ao organizar um exemplo pequeno em HTML e JavaScript, o critério foi fazer preço, prazo e entregáveis saírem da mesma combinação de dados. São dois pacotes e duas revisões, com valores fictícios. O estado guarda as escolhas, não o resultado: let revision = "first"; let plan = "essential"; Uma tabela contém as quatro combinações.

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