Flask Web开发实例3-10怎么样来实现？，flask3-10,Windows环境下，《

Flask Web开发实例3-10怎么样来实现？，flask3-10,Windows环境下，《

Windows环境下，《Flask Web开发》实例3-10 定义收藏夹图标
templates/base.html代码：

{% block head %}{{ super() }}<link rel="shortcut icon" href="{{ url_for('static', filename = 'favicon.ico') }}"    type="image/x-icon"><link rel="icon" href="{{ url_for('static', filename = 'favicon.ico') }}"    type="image/x-icon">{% endblock %}

我把base.html的代码改成上述中的代码，结果运行报错。然后在原来base.html的代码上加上上述代码，能运行成功。
代码：

{% extends "bootstrap/base.html" %}{% block title %}Flasky{% endblock %}{% block navbar %}<div class="navbar navbar-inverse" role="navigation">    <div class="container">        <div class="navbar-header">            <button type="button" class="navbar-toggle"            data-toggle="collapse" data-target=".navbar-collapse">                <span class="sr-only">Toggle navigation</span>                <span class="icon-bar"></span>                <span class="icon-bar"></span>                <span class="icon-bar"></span>            </button>            <a class="navbar-brand" href="/">Flasky</a>        </div>        <div class="navbar-collapse collapse">            <ul class="nav navbar-nav">                <li><a href="/">Home</a></li>            </ul>        </div>    </div></div>{% endblock %}{% block content %}<div class="container">    {% block page_content %}{% endblock %}</div>{% endblock%}{% block head %}{{ super() }}<link rel="shortcut icon" href="{{ url_for('static', filename = 'favicon.ico') }}"    type="image/x-icon"><link rel="icon" href="{{ url_for('static', filename = 'favicon.ico') }}"    type="image/x-icon">{% endblock %}

但是和原来的页面没有区别。书上写了收藏夹图标会显示在游览器的地址栏中，这能实现吗？ 疑问？

git clone https://github.com/miguelgrinberg/flasky.git

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