Custom Stylesheet Classes Ids Conditional Style The import Method And The Tag

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When you're giving the name of the class here, the dot does not appear. Try to name the classes based on their function rather than their presentation. Only one element can be given each id per page. They can be used for elements you know will only occur once, such as header and navigation tables. More often than not, id values are used in JavaScript for referencing page elements, and are necessary for DHTML. Both class and id names can contain characters a-z, A-Z, digits 0-9, underscores and hyphens, but they cannot start with a number or dash. Now, I'll introduce the span tag. It does exactly what you'd expect - it influences any other code that it spans. seo service would create your desired text, without a font tag in sight. Note that the span tag does absolutely nothing on its own without the class attribute. The best part about class implementation is that it isn't confined to any one tag. You use span when there isn't any other tag around the text you want to affect. But; if the text is also being bolded, you can just add the class attribute to that instead, which means the text takes on the effects of the tag and the css in the class. If you wanted all your instances of the class to be bold, you modify the class code - and every occurrence of it on your site changes instantly. But if you only want one instance to be bold, you just add the class to the bold tag that's around that specific text. This saves you having to set up a whole new class when it would be inefficient to do so. If you wanted one of the instances of caution to be the same as the rest, but green instead of red, instead of setting up a whole new class with just this changed, you can override this aspect of the css by putting further style definitions closer to the affected text than the class that defines it. We'll call this 'overriding by proximity', because that sounds cool. Here I've embedded style into the tag, the most powerful overriding technique. If the caution class was specified in an external stylesheet I could have added the modification into a style block and it still would have overridden the class, due to the cascading order defined earlier on in this tutorial. In any case, the text will be displayed in 12pt green Verdana. If you want text vastly different, set up further classes. You can have an unlimited number, so long as they all have different names. Contextual style is a powerful technique that can save you from having to define too many classes. You can have your stylesheet apply CSS rules to an element, depending on what other elements it is contained in. You just list the selectors (which can be element names, classes or ids) in descending order, with single spaces between them. Using this method properly is a real time-saver. All of you out there using XHTML should use lowercase selectors in your code, to match the all lowercase elements in your source code. Above I'm illustrating another technique you can use. Keep Learning // CSS and Text → Go! Other Stylesheets Articles // Introduction to CSS · Advanced CSS · CSS and Text · CSS and Links · CSS and Spacing · CSS and Backgrounds · CSS Layout · CSS and Borders · Named Colours · CSS and Media Types · Advanced Selectors · CSS and Scrollbars · CSS and Cursors · Homepage · Full Index · My First Site · HTML Source is by me, Ross Shannon. I’m a web designer from Ireland, and am currently finishing my PhD in Computer Science.