Magento 2 add body class with pages like cms, category, product and checkout page.
You can set cutom body class for the page in Magento 2 using plugin by Magento\Framework\View\Result\Page class.
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How to check Product has custom options in Magento 2?
You can check if a product has a custom option exists (hasOptions()) or not in Magento 2 by Product Object.
Some product type contains options like Bundle and Configurable while Simple, Virtual, Grouped, Downloadable and gift card doesn’t support options.