Click the Photoshop document and type the text. You can also double-click a text layer in the Layers pane, which highlights the text, and then use the font-size selector to increase the font size.

Text in HTML documents can be rendered at a wide range of sizes. Text size is affected by multiple factors including browser default styles, styles added by the HTML document, browser settings ...

Text size in HTML documents can be affected by multiple factors including browser default styles, styles added by the HTML document and, if the code allows it, browser settings and user style sheets.