Short answer: treat page-break-inside: avoid as a pagination hint, not a guarantee. In wkhtmltopdf, overlap usually appears when the rule is applied to the wrong table element, the content is taller than a page, or a repeated header and moved row compete for limited space. Reproduce the smallest failing document, test the rule on the meaningful row or block, and inspect the PDF for overlap, split text, header artifacts and excessive blank space. Always validate with the exact wkhtmltopdf binary, options, margins and production HTML you deploy.
Why the rule can still produce overlap
CSS defines page-break-inside as a request to adjust breaks inside an element. avoid tells the user agent not to place an inside break where the rule applies when an alternative is available. It does not define a universal algorithm for tables, repeated headers, oversized rows or content that cannot fit on one page. wkhtmltopdf’s WebKit-based renderer has historical reports of ignored break rules, header overlap, border artifacts and unpredictable results around large rows.
Those reports concern particular historical binaries, including 0.12.2.1, 0.12.2.4 and 0.12.5.1, and users’ individual documents. They demonstrate possible failure modes, not a compatibility guarantee or a current-version diagnosis. Record your exact version and platform before changing CSS.
First, isolate the failing layout
- Save the exact command. Record wkhtmltopdf version, operating system, page size, orientation, margins, header/footer options, zoom and any JavaScript delays.
- Reduce the HTML. Keep one table or block, its relevant styles and enough rows to reproduce the overlap. Remove unrelated floats, positioned elements and scripts.
- Make three test cases. Test a row that fits in the remaining space, one that fits only on a fresh page, and one taller than a page. These cases reveal whether the issue is ordinary pagination or impossible-to-keep-together content.
- Compare PDFs, not just CSS. Check text overlap, split text, repeated table headings, orphaned borders and large blank areas. A moved break is not a fix if it creates a worse reader-facing artifact.
Apply the rule at the right scope
The element receiving the declaration matters. A historical wkhtmltopdf report found different behavior when the rule was placed on td versus tr; changing the selector altered both pagination and visual artifacts. That is evidence to test both scopes in your document, not proof that one selector is universally correct.
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Keep a complete row together
table.invoice {
width: 100%;
border-collapse: collapse;
}
table.invoice thead {
display: table-header-group;
}
table.invoice tr {
page-break-inside: avoid;
}
table.invoice td,
table.invoice th {
padding: 6px;
vertical-align: top;
}
Use this when a row is a meaningful unit and normally fits on one page. Test whether your installed renderer honors it. If the row contains a long description, nested table or large image, it may still exceed the available page.
Try the cell scope only when your markup requires it
table.invoice td {
page-break-inside: avoid;
}
Some documents respond differently when the declaration is on cells. This can also produce inconsistent borders or header behavior in wkhtmltopdf, so keep the variant only if the generated PDF is demonstrably better.
Wrap a logical block, but do not assume wrappers solve oversized content
.keep-together {
page-break-inside: avoid;
}
Apply the class to a genuine block such as an invoice section or a card, not to every ancestor indiscriminately. A wrapper can change the renderer’s break candidates, but historical reports do not establish a universally correct wrapper. A block taller than a page cannot be kept intact without overflow, clipping or a move to a new page.
Understand the whitespace trade-off
When the next row does not fit in the remaining space, avoiding a break moves it to the next page. The unused area is expected: preserving the row consumes less of the current page than splitting it. A historical report also described a large blank region when an oversized row was moved. Decide whether that whitespace is preferable to a split or overlap.
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| Approach | Potential benefit | Cost or uncertainty |
|---|---|---|
Apply page-break-inside: avoid to a meaningful row or block |
May keep ordinary content together | Not reliable for every table; can leave whitespace or create artifacts. |
| Change markup or selector scope | Can change the renderer’s break candidates | No selector is proven universally correct; verify the resulting PDF. |
| Allow long content to split | Uses available page space more efficiently | May split text or rows at an undesirable point. |
Design markup that is easier to paginate
Keep table structure valid
Use a real thead, tbody and tr/td hierarchy. Put repeated-column headings in thead and test whether your wkhtmltopdf build repeats them correctly. Avoid using absolutely positioned elements for content that must flow between pages.
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Split unbounded content into smaller units
Instead of one row containing an entire long article, make each paragraph or item a separate row or block. Smaller units give the paginator legal break points and reduce the chance that one impossible-to-fit element triggers a move, overlap or clipping.
Control large images and nested content
img {
max-width: 100%;
height: auto;
}
.long-description {
overflow-wrap: anywhere;
}
These rules do not repair a renderer bug, but they prevent avoidable horizontal overflow and reduce the number of elements that are taller than a page.
Use explicit breaks sparingly
page-break-before: always (or its legacy equivalents) can start a known section on a new page, while page-break-after can end one. Explicit breaks are useful for cover pages and major sections, but adding them to every row magnifies whitespace and can interact badly with repeated headers. Prefer meaningful structural breaks plus tested avoidance rules.
Run a repeatable wkhtmltopdf test
wkhtmltopdf --page-size A4 --margin-top 18mm --margin-right 12mm
--margin-bottom 18mm --margin-left 12mm input.html output.pdf
Use the same command in local and production environments. If your document relies on JavaScript, fonts or remote images, confirm they are available to the process and allow enough loading time. A CSS change is not validated until the PDF generated by the deployed binary has been inspected.
Troubleshooting common symptoms
The rule appears ignored
Confirm the selector matches the element that actually contains the content. Check for a more specific rule, invalid table markup, an element that is taller than a page, or a different stylesheet being loaded in the conversion environment. Test the same HTML with the rule on tr, the relevant block, and (only if needed) td; compare artifacts rather than assuming a selector move is safe.
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A header overlaps the first row
Check header HTML, top margin and any header-spacing option together. A repeated table header and a document header both consume vertical space. Reduce header height, increase the top margin, or simplify the header, then retest with a row that begins immediately after the page boundary.
A huge blank area appears
The next avoided element may not fit in the remaining space and has been moved. Test whether splitting a long description into smaller blocks produces an acceptable result. If the element is taller than a page, redesign it; no break-avoidance declaration can make it fit intact.
Borders are broken or duplicated
Compare border-collapse: collapse and separate borders in a minimal table. A historical report associated selector changes with border artifacts. Keep the variant that preserves readable boundaries across page breaks.
Results differ between machines
Record binary version, operating system, fonts, locale, page settings and input assets. Historical issue reports are not a current compatibility matrix, so a result from one build cannot be generalized to another.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose a fix using two acceptance criteria
- Content integrity: no overlap, clipped text, missing content or unacceptable row splits.
- Page quality: reasonable whitespace, correct repeated headings, intact borders and consistent section starts.
Generate representative PDFs after every change, including the largest real rows and the longest localized strings. Keep a known-good PDF or image comparison in your build checks if pagination is business-critical.
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Frequently Asked Questions
Can CSS guarantee that a wkhtmltopdf row will never split?
No. The declaration is a hint interpreted by the renderer, and content taller than a page cannot be kept intact without another layout consequence.
Should I use modern break-inside instead?
You may test it, but the documented failures here concern wkhtmltopdf behavior. Verify support and output in the exact binary you deploy rather than assuming a property rename changes pagination.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Is a blank area always evidence of a bug?
No. It can be the expected result of moving an avoided row to the next page. It becomes a defect when the whitespace or resulting artifacts make the document less usable than an acceptable split.
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