Adobe Acrobat 8 3D - Manual (Page 321)

314 ADOBE ACROBAT 3D VERSION 8
User Guide
About watermarks and screen readers
You can add a watermark to a tagged PDF without also adding it to the tag tree. Not having the watermark appear in
the tag tree is helpful for people who are using screen readers, because they won’t hear the watermark read as
document content.
The best way to add a watermark that doesn’t interfere with screen readers is to insert an untagged PDF of the
watermark into a tagged PDF.
See also
“Add and edit watermarks” on page 131
Editing document structure with the Content and Tags
tabs
Correct reflow problems with the Content tab
Use the Content tab to correct reflow problems in a PDF that can’t be corrected by using the TouchUp Reading Order
tool. Because you can damage a PDF by editing content objects, make sure that you’re familiar with PDF structure
before you make any changes. For comprehensive information about PDF structure, see the PDF Reference Fifth
Edition: Adobe Portable Document Format Version 1.6, on the
PDF reference page (English only) of the Adobe
website.
The Content tab provides a hierarchical view of the objects that make up a PDF, including the PDF object itself. Each
document includes one or more pages, a set of annotations (such as comments and links), and the content objects
for the page, consisting of containers, text, paths, and images. Objects are listed in the order in which they appear on
the page, similar to tags in the logical structure tree. However, PDFs don’t require tags for you to view or change the
object structure.
1 Choose View > Navigation Panels > Content.
2 Click the plus sign (+) (Windows) or the triangle (Mac OS) next to the document name to view pages and objects.
3 Move a container or object by selecting it and doing one of the following:
• Drag it to the location you want.
• Choose Cut from the Options menu, select the tag above the location you want to paste the cut tag, and choose
Paste from the Options menu.
Note: Container elements can’t be pasted directly to page elements. To move a container to another page, cut the
container you want to move, select a container on the page you want to move the container to, and choose Paste from
the Options menu. Then, drag the container out one level to the location that you want.
Content tab options
In the Content tab, use the Options menu or right-click/Control-click an object to choose from the following
options:
New Container Adds a new container object at the end of the selected page or container.
Edit Container Dictionary Specifies the dictionary for the container. Errors in this dialog box may damage the PDF.
Available only for containers that include dictionaries.