我用以下代码行写了一个markdown.md。
<span style="font-family: Open Sans; font-weight: 300; font-size: 16px; font-style: normal">300 Light normal hamburgefonstiv</span>
<br /> <span style="font-family: Open Sans; font-weight: 300; font-size: 16px;font-style: italic">300 Light italic hamburgefonstiv</span>
<br /> <span style="font-family: Open Sans; font-weight: 400; font-size: 16px; font-style: normal">400 Regular normal hamburgefonstiv</span>
<br /> <span style="font-family: Open Sans; font-weight: 400; font-size: 16px;font-style: italic">400 Regular italic hamburgefonstiv</span>
<br /> <span style="font-family: Open Sans; font-weight: 600; font-size: 16px; font-style: normal">600 Semibold normal hamburgefonstiv</span>
<br /> <span style="font-family: Open Sans; font-weight: 600; font-size: 16px;font-style: italic">600 Semibold italic hamburgefonstiv</span>
<br /> <span style="font-family: Open Sans; font-weight: 700; font-size: 16px; font-style: normal">700 Bold normal hamburgefonstiv</span>
<br /> <span style="font-family: Open Sans; font-weight: 700; font-size: 16px;font-style: italic">700 Bold italic hamburgefonstiv</span>
<br /> <span style="font-family: Open Sans; font-weight: 800; font-size: 16px; font-style: normal">800 ExtraBold normal hamburgefonstiv</span>
<br /> <span style="font-family: Open Sans; font-weight: 800; font-size: 16px;font-style: italic">800 ExtraBold italic hamburgefonstiv</span>
当我打开浏览器时,我看到了这一点。它工作正常。当我在Github上打开markdown.md时,我只看到文本行作为普通文本。怎么了?带有span元素的想法是正确的吗?