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"""Test CSS nesting."""
import pytest
from ..testing_utils import assert_no_logs, render_pages
@assert_no_logs
@pytest.mark.parametrize('style', (
'div { p { width: 10px } }',
'p { div & { width: 10px } }',
'p { width: 20px; div & { width: 10px } }',
'p { div & { width: 10px } width: 20px }',
'div { & { & { p { & { width: 10px } } } } }',
'@media print { div { p { width: 10px } } }',
'div { em, p { width: 10px } }',
'p { a, div & { width: 10px } }',
))
def test_nesting_block(style):
page, = render_pages('''
<style>%s</style>
<div><p></p></div><p></p>
''' % style)
html, = page.children
body, = html.children
div, p = body.children
div_p, = div.children
assert div_p.width == 10
assert p.width != 10
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