Magento theme inheritance
The frontend of Magento allows designers to create new themes based on the basic blank theme, reusing the main code without changing its structure. The fallback system is a theme's inheritance mechanism and allows developers to create only the files that are necessary for customization.
The Luma theme, for example, uses the fallback system by inheriting the blank theme basic structure. The Luma theme parent is declared in its theme.xml file as follows:
<theme xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Config/etc/theme.xsd">
<title>Magento Luma</title>
<parent>Magento/blank</parent>
<media>
<preview_image>media/preview.jpg</preview_image>
</media>
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