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CSS 2 vs CSS 3

Pregunta 26. Can I include comments in my Style Sheet?

Yes. Comments can be written anywhere where whitespace is allowed and are treated as white space themselves. Anything written between /* and */ is treated as a comment (white space). NOTE: Comments cannot be nested.

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Pregunta 27. What is the difference between ID and CLASS?

ID identifies and sets style to one and only one occurrence of an element while class can be attached to any number of elements. By singling out one occurrence of an element the unique value can be declared to said element.

CSS
#eva1 {background: red; color: white}
.eva2 {background: red; color: white}

HTML - ID
Paragraph 1 - ONLY THIS occurrence of the element P (or single occurrence of some other element) can be identified as eva1
Paragraph 2 - This occurrence of the element P CANNOT be identified as eva1

HTML - CLASS
Paragraph 1 - This occurrence of the element P can be classified as eva2
Paragraph 2 - And so can this, as well as occurrences of any other element,

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Pregunta 28. How to make text-links without underline?

a:link, a:visited {text-decoration: none}

or

...will show the links without underlining. However, suppressing the underlining of links isn't a very smart idea as most people are used to having them underlined. Also, such links are not spotted unless someone coincidentally runs a mouse over them. If, for whatever reason, links without underline are required background and foreground colors can be instead declared to them so that they can be distinguished from other text, e.g.;

a:link, a:visited {text-decoration: none; background: red; color: blue}

or

Both background and foreground colors should be specified as the property that is not specified can be overridden by user's own settings.

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Pregunta 29. How do you make a tool tip that appears on hover?

The most simple way is to use the 'title' attribute like this...

HTML
like this

CSS
a.tooltip {
position:relative;
cursor:help;
}
a.tooltip span {
display: none;
position:absolute;
top:1.5em;
left:0;
width:15em;
padding:0 2px;
}
a.tooltip:hover {
display:inline;
}
a.tooltip:hover span {
display:block;
border:1px solid gray;
background-color:white;
}

HTML

<a class="tooltip" href="#n">Karl Marx-info goes here-</a>

Without this part... a.tooltip:hover {
display:inline;
}

..it won't work in IE.

The "#n" in the link is to prevent the page from jumping to the top if the link is clicked. The "href" part is necessary as it won't work in IE without it.

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Pregunta 30. Which characters can CSS-names contain?

The CSS-names; names of selectors, classes and IDs can contain characters a-z, A-Z, digits 0-9, period, hyphen, escaped characters, Unicode characters 161-255, as well as any Unicode character as a numeric code. The names cannot start with a dash or a digit. (Note: in HTML the value of the CLASS attribute can contain more characters).

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