def is_safe_css(self, propname, value):
        if propname not in self.safe_css:
            return False
        if propname.startswith('margin') and '-' in value:
            # Negative margins can be used for phishing
            return False
        return True
>>> from defcon.test.testTools import getTestFontPath
dataset/ETHPy150Open timonwong/OmniMarkupPreviewer/OmniMarkupLib/Renderers/libs/python3/genshi/filters/html.py/HTMLSanitizer.is_safe_css--crossover with--dataset/ETHPy150Open typesupply/defcon/Lib/defcon/objects/glyph.py/_testBounds