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The user needs to perform an action on the data entered in a form, such as submitting a query, or saving or previewing their content.
The primary goal of Web form design is to get people through a form quickly and painlessly. Where possible, create forms for a single purpose and provide a single button to complete that task.
Sometimes, however, forms will require additional, secondary actions, such as 'preview' as an alternative to 'save'. In such cases, visual distinctions are a useful method for helping people make good choices. The most important distinction is between the the primary submit button and any secondary buttons (the 'primary' submit button is the submit button that is essential to the form, and which fulfills its primary purpose). Therefore, in multi-button forms, the primary form button should be visually emphasized. For consistency, single-button forms should also visually emphasize their submit button.