The first step to optimize your digital publications for different web browsers is to choose the right format for your project. InDesign offers several options for exporting your documents as digital publications, such as PDF, EPUB, HTML, and Publish Online. Each format has its own advantages and limitations, depending on your goals, audience, and content. For example, PDF is a universal and secure format that preserves the layout and interactivity of your document, but it might not be compatible with some mobile devices or screen readers. EPUB is a flexible and accessible format that adapts to different screen sizes and devices, but it might not support some fonts, graphics, or animations. HTML is a web-based format that can be viewed on any browser, but it might not have the same quality or functionality as your original document. Publish Online is a cloud-based service that lets you share your document online with a unique URL, but it might not be available in some regions or for some browsers.