Use the modern CSS Fragmentation properties in your print stylesheet: break-before: page (or break-after: page) to force a new PDF page, and break-inside: avoid-page to discourage a suitable block from splitting. These rules work only in a paged print context, so test the actual PDF produced by your browser or HTML-to-PDF engine.
@media print {
.new-page { break-before: page; }
.keep-together { break-inside: avoid-page; }
}Choose the rule that matches the problem
Page overflow usually means one of two different things. You may need a deliberate boundary before a section, or you may need to keep a small block intact. Do not use an avoidance rule when you actually need a forced page.
| Goal | Use | What it does |
|---|---|---|
| Start an element on a fresh page | break-before: page |
Forces a page break before the element. |
| End an element and start the next page | break-after: page |
Forces a page break after the element. |
| Keep a short block together where possible | break-inside: avoid-page |
Discourages a break inside the block; it cannot shrink content or fit an oversized block onto one page. |
The modern properties are preferred for new CSS. Older declarations such as page-break-before: always, page-break-after: always, and page-break-inside: avoid remain as legacy aliases for compatibility.
Force a page before a section
Put the break on the block that should begin on the next page. Use a semantic class rather than selecting every heading, because a heading may legitimately follow the preceding content on the same page.
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<article>
<section class="chapter">
<h1>Introduction</h1>
<p>Content for the first chapter.</p>
</section>
<section class="chapter new-page">
<h1>Methods</h1>
<p>This section starts on a new PDF page.</p>
</section>
</article>@media print {
.new-page {
break-before: page;
}
}The target must generate a box in normal print flow. A rule on an element with no generated box has nothing to fragment, so it is ignored. Check that the class is present in the printed DOM and that another selector is not overriding it.
Force a page after the preceding block
You can express the same boundary from the other side. This is useful when a component always ends a page, regardless of which section follows it.
@media print {
.chapter-end {
break-after: page;
}
}Use one boundary rule while debugging. Applying break-after: page to one element and break-before: page to the adjacent element is redundant and can produce an unexpected blank page.
Keep a block from splitting
break-inside: avoid-page is a request to place an intact block on one page when the renderer can do so. It is appropriate for a summary card, a short figure-and-caption group, a signature area, or a compact table row group.
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.summary-card,
.figure-caption-group {
break-inside: avoid-page;
}
}Choose a block that can actually fit in the printable area. If its height exceeds the page, the renderer cannot honor the request without hiding or resizing content. Applying avoidance to an entire long article can also create poor pagination: the engine may move a large block to the next page and leave a large blank region. Split the content into smaller meaningful groups or allow the long content to break.
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Understand how competing break rules resolve
Fragmentation considers the previous box’s break-after, the next box’s break-before, and the containing element’s break-inside. A forced break takes precedence over an avoidance value. When two forced values meet at one boundary, the value later in the flow wins; in practice, a following element’s break-before takes precedence over the preceding element’s break-after.
For example, if a card has break-after: page but the next section has break-before: avoid-page, the forced break still applies. If both neighboring elements force a break, remove one while diagnosing the layout so you can see which boundary is intended.
Put rules in print media and set page geometry separately
Keep pagination declarations in a print stylesheet so they do not affect the continuous screen layout.
@media print {
.new-page { break-before: page; }
.keep-together { break-inside: avoid-page; }
}
@page {
size: A4;
margin: 18mm 16mm;
}@page controls page setup such as paper size and margins. Break properties control where content fragments within that available area. A margin change can move a block to the following page even when the break rules are unchanged. Browser print dialogs may also apply user-selected paper, scale, headers, footers, or margins, so record those settings when reproducing a problem.
A complete print stylesheet pattern
This example establishes a new page for each chapter, keeps small callouts together, and permits a long article to flow naturally.
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<main class="report">
<section class="chapter">
<h1>Executive summary</h1>
<div class="summary-card keep-together">
<p>A short summary that should remain intact.</p>
</div>
</section>
<section class="chapter new-page">
<h1>Detailed findings</h1>
<p>This section starts on a fresh page.</p>
<div class="figure-caption-group keep-together">
<figure>
<img src="chart.png" alt="Results chart">
<figcaption>Results by month.</figcaption>
</figure>
</div>
</section>
</main>@media print {
.new-page {
break-before: page;
}
.keep-together {
break-inside: avoid-page;
}
}
@page {
size: Letter;
margin: 0.7in;
}Do not put the forced break on a heading that is removed or repositioned by print-only styles. Put it on the section or other block that owns the content you want to move.
Why a break may appear to be ignored
Print CSS is not active
Confirm that the declaration is inside @media print and that the print stylesheet is loaded. In browser developer tools, enable print emulation and inspect the element’s computed styles.
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Inspect the printed DOM, not only the screen markup. Frameworks may render a different wrapper for print, and a class on a non-generated element has no fragmentation effect.
A cascade override wins
Check later rules, higher-specificity selectors, inline styles, and print utility classes. Look at the computed value for break-before, break-after, and break-inside on the boxes immediately before and after the intended boundary.
The content does not fit the usable page
Inspect @page size and margins, browser print margins, scale, and any fixed-height container. A block that is taller than the printable region cannot be kept intact. Remove an unnecessary fixed height, reduce the grouping, or allow the content to fragment.
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Adjacent forced breaks create a blank page
Search for both sides of the boundary. Keep either break-after: page on the preceding block or break-before: page on the following block while testing.
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Flex, grid, tables, positioned elements, transforms, and nested overflow containers can change how content fragments. Reduce the document to a small reproduction, then add the layout pieces back one at a time. A rule that works for ordinary block flow is not proof that every complex layout will paginate identically.
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Tables
Keep avoidance on a small row group or caption rather than an entire multi-page table. Let the table split when it is longer than one page, and verify the header-row behavior in the renderer that creates the final PDF.
Flex and grid
Test the actual engine and version. Chromium’s LayoutNG implementation added flex and grid fragmentation in Chrome 103, table fragmentation in Chrome 106, and block fragmentation for printing in Chrome 108. These milestones describe Chromium implementation history, not a guarantee that every browser or server-side PDF pipeline will paginate the same way.
Fixed, transformed, or overflowed content
Large fixed-height boxes, overflow: hidden, transforms, and absolutely positioned content can hide or move material outside normal fragmentation. Remove those constraints in a reduced test case before adding more break declarations.
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Validate the PDF from the real renderer
- Open the document with the same browser or HTML-to-PDF service used in production.
- Enable print preview or print-media emulation and verify the computed break property.
- Check paper size, margins, scale, and browser-added headers or footers.
- Save the PDF and inspect the file, not only the preview.
- Repeat the check after changing the renderer version or layout model; pagination is implementation-dependent.
CSS fragmentation applies inside a paged fragmentation context. Ordinary screen rendering is a continuous canvas, so a page break can appear to do nothing until print media or PDF generation is active.
Use legacy aliases only when compatibility requires them
For older templates, this declaration remains recognizable:
@media print {
.new-page {
page-break-before: always;
}
.keep-together {
page-break-inside: avoid;
}
}The legacy page-break-* properties are aliases. page-break-before: always and page-break-after: always map to the page-specific behavior of the modern properties. For new code, use break-before, break-after, and break-inside so the intent is explicit and the same syntax can support other fragmentation contexts.
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