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When preload is employed, you can use autoplay, but I m not sure that it makes much sense to do so. Autoplay starts the audio playing as soon as the page loads, while preload is used to load an audio file before the play command is issued by the controller. You can assign values to the preload attribute:
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none: Having none as a value may seem strange, but some browsers may be set to
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automatically preload audio files. However, if the chance of using a particular audio is remote, the developer may decide not to use Internet resources and so assigns the none value to the preload attribute.
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CHAPTER 10: SOUND
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metadata: All audio (and video) files have metadata like duration or some other sound data that the sound author placed in the audio s file. When the chance of using an audio file is low, but (just in case) loading the metadata is reasonable and doesn t take up much in the way of Internet resources. auto: If the preload attribute is present, it automatically preloads the audio file
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information. The auto assignment simply acts as a reminder that the file is going to preload. (It s the same as not have any value assignment to a preload attribute.) The more varied your audience and the more audio in your Web page, the more you want to provide the preload attribute with options.
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LOOP
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When you want a sound to endlessly repeat itself, you use a loop. The advantage of using a loop is that you can take a relatively short piece of music and have it repeat itself so that it sounds like a full composition. In this way, you can use a minimum amount of Internet resources and have continuous music. The format is like the other attributes that act like Booleans they re either off or on. The following is an example:
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In that line lies the seeds of its own destruction. For many good reasons, users may want to turn off sound. You can use JavaScript to put together a simple routine that will do that, but it s easier simply to add the controls attribute and let the user turn it off. However, some designers, with good reason, would rather not have the audio control anywhere in the design; they believe that some nice music would be an integral part of the design. In that case, start looking up the JavaScript to turn the thing off. No matter how nice a piece of sound is, repeated endlessly it becomes brainwashing, and that s not allowed by the Geneva Convention.
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BROWSER SUPPORT FOR AUDIO
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At the time of this writing, while testing audio formats, I could find no format that all browsers supported. Worse still, no single format is supported by all HTML5 browsers. Table 10.1 shows the breakdown.
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Table 10.1
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Browser
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Chrome Firefox
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Browsers and Audio Format Support
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Yes No Yes No Yes
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No Yes No Yes Yes
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Yes Yes No* No No
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Internet Explorer 9* Opera Safari
* Microsoft announced that IE9 would be supporting the OGG format, but in the beta version of IE9, it did not.
PART III: MEDIA IN HTML5
As you can see, the only audio format that comes close to support by all browsers is .wav. The good news is that .wav files are widely available, and you can find just about any sound you in .wav format. However, if a significant number of your user audience prefers the Google Chrome browser to the others, you re going to need a Plan B.
SAVED BY SOURCE: PLAN B
Usually, if you have to determine which browser is going to work with different resources, you re going to have to break out the JavaScript. Fortunately, HTML5 has an element that can offer up several different audio formats and let the browser select the one that s compatible. The <source> tag can be placed within the <audio> container with the source and URL of the audio inside the <source> tag. Suppose that you re running a Web site with audio instructional materials you talk learners through HTML5, for example. Instead of telling everyone that they have to use a certain type of browser, all you need to do is have files for all possible browsers and let the browser pick the one it likes. For example, let s say that you re setting up Lesson #3 on a Web page. The following would provide a selection of files that no browser would pass up:
<audio controls> <source src= instruction3.ogg > <source src= instruction3.mp3 > <source src= instruction3.wav > </audio>
The chore of making multiple versions of audio files may be annoying, but even if you programmed it in JavaScript, you d need multiple copies of the media. (In 9, multiple copies of a graphic file were required for mobile and non-mobile platforms that used JavaScript to sort out whether the page was being viewed on an iPhone or something else.)