HTML tag to prevent HTML tags to be executed?

问题:

Basic question which I thought of asking on Superuser, but it is a programming question I think. I just started learning HTML, so please bear with me.

How can I prevent a program from interpreting an HTML tag / syntax? For example, I want to write a flash card like this:

The html code for < is <

I would like a solution that would work for any or most syntax, not just for <.

How can I enter the syntax (without any space) to make sure the code isn't interpreted?

回答1:

You are going to have to do it manually.

Here you have the full encoding table. The most commonly used codes are:

Character  Entity Number  Entity Name  Description
"          "          "       quotation mark
'          '          '       apostrophe (does not work in IE)
&          &          &        ampersand
<          &#60;          &lt;         less-than
>          &#62;          &gt;         greater-than

回答2:

This:

The html code for < is <

Renders as:

The html code for < is &lt;

The basic strategy is to escape the & as &

回答3:

I suppose you don't want the entity to be rendered? If you want to display < you'll have to use the entity for the ampersand: &.

回答4:

In this case, you DON'T need to encode it. Try this one:

<xmp> html < &lt; </xmp>

I'm not sure about cross browsers support, but works on IE7,FF3,Chrome3

回答5:

The html code for < is &lt;

That is, type < is <.

回答6:

If you have access to server side scripting capabilities, you might be able to use utility functions of that platform. For example, in PHP you might use the htmlentities function to your advantage:

echo htmlentities("The html code for < is &lt;");

回答7:

You could use a <pre> &lt; </pre> sequence

回答8:

You need to encode it. For example, '<' = '&lt;'

Here is the list.

So in your case it will end up like this:

The html code for < is & l t ;