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feat: add configurable custom HTML head injection

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Allow deployers to inject custom HTML into the <head> of every page
via the CUSTOM_HEAD_HTML config option, useful for analytics scripts
(Plausible, Matomo, etc.) without modifying source.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Jorijn Schrijvershof
2026-02-17 11:14:15 +01:00
parent de2290639f
commit a3de6cce20
5 changed files with 42 additions and 0 deletions
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tests/html/test_jinja_env.py
+25
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@@ -147,3 +147,28 @@ class TestTemplateRendering:
assert "<html" in html
assert "<head>" in html
assert "<body>" in html
def test_custom_head_html_rendered_when_set(self):
"""Custom head HTML appears in rendered output when provided."""
env = get_jinja_env()
template = env.get_template("base.html")
snippet = '<script defer data-domain="example.com" src="https://plausible.io/js/script.js"></script>'
html = template.render(
title="Test",
custom_head_html=snippet,
)
assert snippet in html
assert html.index(snippet) < html.index("</head>")
def test_custom_head_html_absent_when_empty(self):
"""No extra content in head when custom_head_html is empty."""
env = get_jinja_env()
template = env.get_template("base.html")
html_with = template.render(title="Test", custom_head_html="")
html_without = template.render(title="Test")
# Both should produce identical output (no extra content)
assert html_with == html_without