landing_utils.py 文件源码-python代码片段

landing_utils.py 文件源码

python

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def async_css(href):
    """
    Outputs a link and noscript tag, which will asynchronously load an external stylesheet.

    Sample usage::

        <head>
        ...
            {% async_css '/static/foo.css' %}
        ...
        </head>

    Results in::

        <head>
        ...
            <link rel="preload" href="/static/foo.css" onload="this.rel='stylesheet'">
            <noscript><link rel="stylesheet" href="/static/foo.css"></noscript>
        ...
        </head>
    """
    return format_html(''.join([
        '<link rel="preload" href="{0}" as="style" onload="this.rel=\'stylesheet\'">',
        '<noscript><link rel="stylesheet" href="{0}"></noscript>'
    ]), href)