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2012-09-29 13:05:38

Maxious

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[HTML5 Boilerplate homepage](http://html5boilerplate.com) | [Documentation

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table of contents](README.md)

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# Extend and customise HTML5 Boilerplate

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Here is some useful advice for how you can make your project with HTML5

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Boilerplate even better. We don't want to include it all by default, as not

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everything fits with everyone's needs.

## DNS prefetching

In short, DNS Prefetching is a method of informing the browser of domain names

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referenced on a site so that the client can resolve the DNS for those hosts,

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cache them, and when it comes time to use them, have a faster turn around on

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the request.

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### Implicit prefetches

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There is a lot of prefetching done for you automatically by the browser. When

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the browser encounters an anchor in your html that does not share the same

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domain name as the current location the browser requests, from the client OS,

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the IP address for this new domain. The client first checks its cache and

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then, lacking a cached copy, makes a request from a DNS server. These requests

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happen in the background and are not meant to block the rendering of the

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page.

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The goal of this is that when the foreign IP address is finally needed it will

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already be in the client cache and will not block the loading of the foreign

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content. Less requests result in faster page load times. The perception of this

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is increased on a mobile platform where DNS latency can be greater.

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#### Disable implicit prefetching

```html

```

Even with X-DNS-Prefetch-Control meta tag (or http header) browsers will still

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prefetch any explicit dns-prefetch links.

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**_WARNING:_** THIS MAY MAKE YOUR SITE SLOWER IF YOU RELY ON RESOURCES FROM

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FOREIGN DOMAINS.

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### Explicit prefetches

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Typically the browser only scans the HTML for foreign domains. If you have

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resources that are outside of your HTML (a javascript request to a remote

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server or a CDN that hosts content that may not be present on every page of

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your site, for example) then you can queue up a domain name to be prefetched.

```html

```

You can use as many of these as you need, but it's best if they are all

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immediately after the [Meta

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Charset](https://developer.mozilla.org/en/HTML/Element/meta#attr-charset)

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element (which should go right at the top of the `head`), so the browser can

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act on them ASAP.

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#### Common Prefetch Links

Amazon S3:

```html

```

Google APIs:

```html

```

Microsoft Ajax Content Delivery Network:

```html

```

### Browser support for DNS prefetching

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Chrome, Firefox 3.5+, Safari 5+, Opera (Unknown), IE 9 (called "Pre-resolution"

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on blogs.msdn.com)

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### Further reading about DNS prefetching

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* https://developer.mozilla.org/En/Controlling_DNS_prefetching

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* http://dev.chromium.org/developers/design-documents/dns-prefetching

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* http://www.apple.com/safari/whats-new.html

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* http://blogs.msdn.com/b/ie/archive/2011/03/17/internet-explorer-9-network-performance-improvements.aspx

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* http://dayofjs.com/videos/22158462/web-browsers_alex-russel

## Search

### Direct search spiders to your sitemap

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[Learn how to make a sitemap](http://www.sitemaps.org/protocol.php)

```html

```

### Hide pages from search engines

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According to Heather Champ, former community manager at Flickr, you should not

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allow search engines to index your "Contact Us" or "Complaints" page if you

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value your sanity. This is an HTML-centric way of achieving that.

```html

```

**_WARNING:_** DO NOT INCLUDE ON PAGES THAT SHOULD APPEAR IN SEARCH ENGINES.

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### Firefox and IE Search Plugins

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Sites with in-site search functionality should be strongly considered for a

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browser search plugin. A "search plugin" is an XML file which defines how your

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plugin behaves in the browser. [How to make a browser search

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plugin](http://www.google.com/search?ie=UTF-8&q=how+to+make+browser+search+plugin).

```html

```

## Internet Explorer

### Prompt users to switch to "Desktop Mode" in IE10 Metro

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IE10 does not support plugins, such as Flash, in Metro mode. If your site

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requires plugins, you can let users know that via the X-UA-Compatible meta

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element, which will prompt them to switch to Desktop Mode.

```html

```

Here's what it looks like alongside H5BP's default X-UA-Compatible values:

```html

```

You can find more information in [Microsoft's IEBlog post about prompting for

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plugin use in IE10 Metro

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Mode](http://blogs.msdn.com/b/ie/archive/2012/01/31/web-sites-and-a-plug-in-free-web.aspx).

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### IE Pinned Sites (IE9+)

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Enabling your application for pinning will allow IE9 users to add it to their

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Windows Taskbar and Start Menu. This comes with a range of new tools that you

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can easily configure with the elements below. See more [documentation on IE9

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Pinned Sites](http://msdn.microsoft.com/en-us/library/gg131029.aspx).

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### Name the Pinned Site for Windows

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Without this rule, Windows will use the page title as the name for your

application.

```html

```

### Give your Pinned Site a tooltip

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You know — a tooltip. A little textbox that appears when the user holds their

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mouse over your Pinned Site's icon.

```html

```

### Set a default page for your Pinned Site

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If the site should go to a specific URL when it is pinned (such as the

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homepage), enter it here. One idea is to send it to a special URL so you can

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track the number of pinned users, like so:

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`http://www.example.com/index.html?pinned=true`

```html

```

### Recolor IE's controls manually for a Pinned Site

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IE9+ will automatically use the overall color of your Pinned Site's favicon to

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shade its browser buttons. UNLESS you give it another color here. Only use

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named colors (`red`) or hex colors (`#ff0000`).

```html

```

### Manually set the window size of a Pinned Site

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If the site should open at a certain window size once pinned, you can specify

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the dimensions here. It only supports static pixel dimensions. 800x600

minimum.

```html

```

### Jump List "Tasks" for Pinned Sites

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Add Jump List Tasks that will appear when the Pinned Site's icon gets a

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right-click. Each Task goes to the specified URL, and gets its own mini icon

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(essentially a favicon, a 16x16 .ICO). You can add as many of these as you

need.

```html

```

### (Windows 8) High quality visuals for Pinned Sites

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Windows 8 adds the ability for you to provide a PNG tile image and specify the

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tile's background color. [Full details on the IE

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blog](http://blogs.msdn.com/b/ie/archive/2012/06/08/high-quality-visuals-for-pinned-sites-in-windows-8.aspx).