#HTML's elements and attributes

HTML elements are defined by a start tag, content, and an end tag:

<tagname attribute="value">content</tagname>

Attribute values can be enclosed in either single quotes or double quotes.

For example:

<!-- This is a comment -->
<h1> Heading Level 1 </h1>
<h2> Heading Level 2 </h2>
<p> Paragraph </p>
<a href="https://xplanc.org/"> Hyperlink </a>

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#Block Elements and Inline Elements

Block elements take up the full width of a line, while inline elements are part of a line.

<h1> Heading is a block element </h1>
<p> Paragraph is a block element </p>

<p> <span>span</span> and <a href='https://xplanc.org/'> hyperlink </a> are inline elements </p>

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#Spaces and Line Breaks

In HTML, whitespace characters are part of the syntax but typically display as a single space. To show multiple spaces or line breaks, use the escape character   for spaces and the <br/> tag for line breaks.

<p> 
    A                  B      <!-- Only one space is displayed -->
    A&nbsp;&nbsp;B            <!-- Two spaces are displayed -->
    <br/>                     <!-- Line break -->

    C                        <!-- No line break, only one space displayed -->
    D
    C&nbsp;&nbsp;D
</p>

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