Reference Link : Link
You use the Web Page Editor Palette to edit and create a variety of tags, such as HTML, JSP, JSF, and so on.
In addition to standard HTML and JSP tags, the Palette displays an item for each tag in the JSP tag libraries that are on the application’s classpath. You drag and drop tags on to the Design or Source view to design Web pages. You can pin the Palette to be open, or set to automatically expand when the cursor is placed over it while it is in its collapsed state.
To access the Palette, from your Web project open in the Project Explorer, right-click a page on which you are planning to drop or edit tags, and then select
Open With > Web Page Editor from the drop-down menu.