What HTML can I use in my entry?

HTML is short for Hyper Text Markup Language. These are instructions, called tags, to your browser that allow you to "mark up" your text. You can use HTML to change the color or size of your font, insert images or make your text bold or italic. The tags allowed in entries are as follows:

<a> <b> <big> <blockquote> <br> <center> <cite> <code> <dd> <div> <dl> <dt> <em> <font> <form> <h1> <h2> <h3> <h4> <h5> <h6> <hr> <i> <img> <input> <li> <marquee> <nobr> <ol> <option> <p> <pre> <s> <select> <small> <span> <strike> <strong> <sub> <sup> <table> <td> <textarea> <th> <tr> <tt> <u> <ul> <xmp>

There is also Dreamwidth specific markup. You can use all the HTML tags listed above in comments, apart from the <form> and <input> tags.

You can't use any JavaScript in your entries or comments. This is for security reasons, as malicious JavaScript can be used to do things like gain access to other people's account information.

Dreamwidth has a guide to using the most common HTML. For more information, please see w3schools.