css-inline

Fast CSS inlining written in Rust

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Project description

Fast CSS inlining for Python implemented in Rust.

Features:

Removing style tags after inlining;
… more features will be available soon

NOTE. This library is in active development and provides a small number of features at the moment, see Limitations sections below for more information.

Installation

To install css_inline via pip run the following command:

pip install css_inline

Usage

To inline CSS in a HTML document:

import css_inline

HTML = """<html>
<head>
    <title>Test</title>
    <style>
        h1, h2 { color:blue; }
        strong { text-decoration:none }
        p { font-size:2px }
        p.footer { font-size: 1px}
    </style>
</head>
<body>
    <h1>Big Text</h1>
    <p>
        <strong>Solid</strong>
    </p>
    <p class="footer">Foot notes</p>
</body>
</html>"""

inlined = css_inline.inline(HTML)

If you want to inline many HTML documents then you can utilize inline_many that processes the input in parallel.

import css_inline

css_inline.inline_many(["...", "..."])

For customization options use CSSInliner class:

import css_inline

inliner = css_inline.CSSInliner(remove_style_tags=True)
inliner.inline("...")

Performance

Due to the usage of efficient tooling from Mozilla’s Servo project (html5ever, rust-cssparser and others) this library has good performance characteristics. In comparison with other Python projects, it is ~12-15x faster than the nearest competitor.

For inlining CSS in the html document from the Usage section above we have the following breakdown in our benchmarks:

css_inline 0.1.0 - 24.82 us
premailer 3.7.0 - 356.59 us (x14.37)
inlinestyler 0.2.4 - 2.62 ms (x105.82)
pynliner 0.8.0 - 3.03 ms (x122.44)

You can take a look at the benchmarks’ code at benches/bench.py file. The results above were measured with rustc 1.46, Python 3.8 on i8700K, and 32GB RAM.

Limitations

Currently (as of 0.1.0) there are the following notable limitations:

External stylesheets are not resolved (#8)
Inlined CSS is not minimized (#12)
class and id attributes are not removed (#13)

Python support

css_inline supports Python 3.5, 3.6, 3.7, and 3.8.

License

The code in this project is licensed under MIT license. By contributing to css_inline, you agree that your contributions will be licensed under its MIT license.

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0.20.0

Feb 7, 2026

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Jan 23, 2026

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Dec 29, 2025

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Nov 1, 2025

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Jun 17, 2025

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Dec 27, 2024

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Nov 14, 2024

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Apr 27, 2024

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Jul 1, 2023

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Jun 25, 2023

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Jun 18, 2023

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Jun 16, 2023

0.9.0 yanked

Jun 10, 2023

Reason this release was yanked:

security vulnerability in HTML serialization

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Jan 30, 2023

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Nov 10, 2022

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Jul 9, 2020

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Jul 7, 2020

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Jun 27, 2020

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Jun 25, 2020

This version

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Jun 24, 2020

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