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Use print CSS to control where Headless Chrome splits PDF content: apply break-inside: avoid to components that should stay together, use break-before: page when a section must start on a fresh page, and set the sheet size and margins with @page. These rules guide pagination; they cannot keep an element intact if it is taller than the usable page area, so regenerate and inspect the PDF after each change.
Why Headless Chrome breaks content across pages
When Chrome prints a document, it lays content out across pages using CSS fragmentation. A page is a fragmentainer: a box may fit within one page, or split across page boundaries when the layout permits. Chromium’s documentation describes block fragmentation and the search for acceptable unforced break points; LayoutNG block fragmentation initially shipped in Chrome 102. That implementation detail is not a guarantee that every browser engine or older Chrome build will paginate identically. Chromium’s fragmentation documentation
The two most useful rules solve different problems. break-inside: avoid asks the browser not to split a particular box internally. break-before: page forces a page break before an element. Neither identifies the right element for you: the selector must match the component or section you intend to control.
Start with these print CSS rules
@media print {
@page {
size: A4;
margin: 18mm;
}
.keep-together {
break-inside: avoid;
}
.new-page {
break-before: page;
}
}This is a starting pattern, not a guaranteed fix for every document. Change the example page size and margins to match the intended output, and add the classes to the elements whose pagination you want to control. Chrome and Firefox support @page for printed page size and margins. Chrome’s guide to printed page margins
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Keep one component together
Put keep-together on a meaningful unit such as a card, short list, or heading-and-content group that should not be split. If the group cannot fit in the remaining space, the browser may move it to another page. If it is taller than the usable page area, it cannot fit intact on a single page; expect overflow or a split rather than assuming avoid can override the page geometry.
Start a section on a new page
Put new-page on the section element that must begin on a fresh page. Since break-before: page acts before that element, applying it to the preceding element would force the break at the wrong boundary.
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Set the printable page area
The @page rule defines page dimensions and margins, which determine the area available to the document’s content. A change to paper size or margins can alter pagination throughout the PDF, so check the full document rather than only the first awkward break.
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Diagnose the first bad break systematically
- Confirm the output path. Identify the Chrome build and whether you print through a dialog, the command line, or an automation library. Pagination behavior depends on the browser and the document’s CSS.
- Find the first incorrect split. Use print preview or save a PDF, then inspect the first page boundary that breaks the intended layout. Determine which element is split and where the next section begins.
- Check print-inherited layout constraints. Look for fixed heights or
overflowclipping from the screen layout. If they cause trouble in print, override them in@media printrather than changing screen styles unnecessarily. - Apply the narrowest useful break rule. Use
break-inside: avoidon a component to discourage an internal split, orbreak-before: pageon a section that needs to start on a new sheet. - Set the page dimensions, regenerate, and inspect every page. Check for newly created blank space, overflow, or a different bad break elsewhere. Adjust one change at a time so its effect is clear.
This is a diagnostic sequence based on the documented print-fragmentation model, not a verified fix for a particular page. Without the page’s HTML, CSS, Chrome version, and intended paper dimensions, no exact selector or final stylesheet can be prescribed.
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Generate and inspect the PDF with Headless Chrome
Chrome’s command-line reference documents --headless --print-to-pdf for creating a PDF. For example, a basic invocation is:
chrome --headless --print-to-pdf=output.pdf https://example.comUse the executable name and any required environment-specific options for your installation. If you do not want Chrome’s generated date, URL, and page-number decorations, add --no-pdf-header-footer. This flag controls browser-generated headers and footers; it does not change the content margins set by @page. The --timeout option sets a maximum wait before capture when content is still loading, so choose a value that fits the page’s actual loading behavior. Chrome Headless command-line reference
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When “break-inside: avoid” does not solve it
- The content is taller than a printable page. It cannot remain intact within the usable page area; reduce its height or allow it to split.
- The wrong element has the rule. Move the class to the box that actually needs to stay together, or to the section that should start on a new page.
- The page geometry is not what you expect. Verify
@pagesize and margins against the intended paper dimensions, then regenerate. - A screen layout constraint carries into print. Inspect fixed heights and overflow clipping, and adjust them in print-specific CSS where appropriate.
- The issue is decoration at a split, not the split location. Chromium added block-fragmentation support for
box-decoration-break: clonein Chrome 130; this affects how box decoration such as borders appears when a box fragments, rather than serving as the primary page-break control. Chrome’s article on box-decoration-break in Chrome 130
Distinguish page margins from browser headers and footers
CSS page margins reserve space around printed content. Chrome’s generated headers and footers are separate decorations, which can be disabled in the print dialog or suppressed in headless command-line output with --no-pdf-header-footer. Chrome 131 added generated content in page margin boxes, as described in its October 30, 2024 article; that capability concerns content placed in the page margins, not a substitute for controlling where document elements break. Chrome’s printed-page margins guide Headless command-line options
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