HTML and CSS Reference
In-Depth Information
1 h e world is all that is the case.
2 What is the case — a fact — is the existence of states of af airs.
3 A logical picture of facts is a thought.
4 A thought is a proposition with a sense.
5 A proposition is a truth-function of elementary propositions. (An elementary proposi-
tion is a truth-function of itself.)
6 h e general form of a truth-function is [p, E, N(E)]. h is is the general form of a
7 What we cannot speak about we must pass over in silence.
h e hgroup element is tied into the outline algorithm in HTML5, and although it's unlikely
that you'll be using it for writers like Wittenstein, it is useful for helping you think about your
page in terms of the structure within an HTML5 page. One way to think about the
<hgroup> tag is as a mask (or even a Romulan cloaking device) over other h elements below
the highest-level element in the hgroup container. In our example, the h3 and h4 are
masked and only the h2 element is recognized as part of the outline.
h roughout the topic, the reference to Cascading Style Sheets will be to CSS3. h at's because
HTML5 and CSS3 are paired in many aspects, but like other elements I discuss in this topic,
those continued from earlier versions have been incorporated in the newest version of HTML
and CSS. We really have a mix of new and old in CSS3, just as in HTML5. So, if you're familiar
with older versions of CSS and you see the same properties in CSS3 references, just treat it as
a continued feature.
In Chapters 1 and 2, you saw examples of CSS3 but were given no explanation of what was
going on to add a new style to an existing element. Here, the focus is on adding style to h
elements. In the next three chapters, you'll see far more aspects of using CSS3. Here, I focus
on the basics of incorporating CSS3 into your HTML5.
All style sheets can be added in three ways:
You can use the <style> tag to dei ne the properties of elements in the HTML5 page.
You can use external style sheets, which are text i les where you store a style you may
want to reuse.
Most professional developers and designers prefer the CSS3 external style sheets because
perfecting the desired style takes a lot of work. When you want to make a change to the
design of a Web site, you can make changes to many pages that use an external style sheet, just
by changing the one style sheet. It's just more ei cient than having to change the <style>
attributes in each individual Web page.
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