Component Behavior When Rendered as PDF

The Visualforce PDF rendering service renders static HTML and basic CSS that is explicitly provided by the page. As a rule, don’t use components that:

• Rely on JavaScript to perform an action
• Depend on Salesforce style sheets
• Use assets such as style sheets or graphics that aren’t available in the page itself or in a static resource

To check if your Visualforce page falls into one of these categories, right-click anywhere on the page and view the HTML source. If you see a <script> tag that refers to JavaScript (.js) or a <link> tag that refers to a style sheet (.css), verify that the generated PDF file displays as expected.