Specify Missing Image Dimensions is a WordPress plugin designed to enhance the performance of your website by addressing missing width and height attributes for images. This tool scans your entire HTML page, identifying images that lack these essential attributes, which can lead to errors in tools such as Google PageSpeed Insights. By automatically adding these dimensions, the plugin aims to eliminate layout shifts during page rendering, thereby improving the user experience and site performance.

The plugin operates by employing the getimagesize() function to accurately determine the dimensions of images on the page. Users can customize their experience by excluding specific images based on file extensions, names, classes, or IDs. This flexibility allows for tailored optimization, ensuring that the plugin works effectively without interfering with other elements on the site.