What’s new?

• Angular Material & CDK Stable Release
• Service Worker support in the CLI
• Improved Universal & AppShell Support in the CLI
• Improved decorator error messages
• TypeScript 2.5 support 

  <h1>News</h1>
  <div>Welcome to our site!</div>

  <h2>World</h2>

  <h3>Title 1</h3>
  <div>description 1.</div>

  <h2>Science</h2>

  <h3>Title 2</h3>
  <div>description 2.</div>

  var headings = document.querySelectorAll('h2, h3');
  for (var i = 0; i < headings.length; i++) {
    if (headings[i].tagName === 'H2') {
      headings[i].style.color = 'blue';
    }
    else {
      headings[i].style.color = 'green';
    }
  }

<h2 style="color: blue">….</h2>
<h3 style="color: green">….</h3>

  <h2>World</h2>

  ...

  <h2>Science</h2>

 <script>
  var headings = document.querySelectorAll('h2');
  for (var i = 0; i < headings.length; i++) {
    headings[i].style.color = 'blue';
    headings[i].style.fontWeight = 'bold';
  }
 </script>

 headings[i].style['font-weight'] = 'bold';

  var headings = document.querySelectorAll('h2');

  for (var i = 0; i < headings.length; i++) {
    headings[i].style.cssText = 'color: blue; font-weight: bold';
  }

h2 { color: blue; }
h3 { color: green; }

 <link href="styles.css" rel="style sheet">

<style>
  h2 { color: blue; }
  h3 { color: green; }
</style>

var sheet = document.styleSheets[0];
sheet.insertRule('h2 { font-style: italic; }', sheet.cssRules.length - 1);

// hide an element
$element.hide();

// show it again
$element.show();

element.setAttribute('hidden', '');

element.removeAttribute('hidden');

<style>
  .box {
    padding: 10px;
    margin: 5px;
    border: 3px solid;
    display: inline-block;
  }
</style>
<span class="box">a box</span>

 // returns 38
var clientHeight = document.querySelector('.box').clientHeight;

// returns 55
var clientWidth = document.querySelector('.box').clientWidth;

 // returns 44
var offsetHeight = document.querySelector('.box').offsetHeight;

// returns 61
var offsetWidth = document.querySelector('.box').offsetWidth;

Beautiful icon transformations 

public class ImageInfo
{
    public Mat Image { set; get; }
    public int ImageGroupId { set; get; }
    public int ImageId { set; get; }
}

var images = new List<ImageInfo>();
 
var imageId = 0;
foreach (var dir in new DirectoryInfo(@"..\..\Images").GetDirectories())
{
    var groupId = int.Parse(dir.Name.Replace("s", string.Empty)) - 1;
    foreach (var imageFile in dir.GetFiles("*.pgm"))
    {
        images.Add(new ImageInfo
        {
            Image = new Mat(imageFile.FullName, LoadMode.GrayScale),
            ImageId = imageId++,
            ImageGroupId = groupId
        });
    }
}

var model = FaceRecognizer.CreateFisherFaceRecognizer();
model.Train(images.Select(x => x.Image), images.Select(x => x.ImageGroupId));
 
var rnd = new Random();
var randomImageId = rnd.Next(0, images.Count - 1);
var testSample = images[randomImageId];
 
Console.WriteLine("Actual group: {0}", testSample.ImageGroupId);
Cv2.ImShow("actual", testSample.Image);
 
var predictedGroupId = model.Predict(testSample.Image);
Console.WriteLine("Predicted group: {0}", predictedGroupId);

<ul class="list-group"> 
  <li class="list-group-item">Item 1</li> 
  <li class="list-group-item">Item 2</li> 
  <li class="list-group-item">Item 3</li> 
</ul>

{
  "version": "1.0.0-*",
 
    "dependencies": {
        "NETStandard.Library": "1.6.0",
        "Microsoft.AspNetCore.Http.Extensions": "1.0.0",
        "Microsoft.AspNetCore.Mvc.Abstractions": "1.0.1",
        "Microsoft.AspNetCore.Mvc.Core": "1.0.1",
        "Microsoft.AspNetCore.Mvc.ViewFeatures": "1.0.1",
        "Microsoft.AspNetCore.Razor.Runtime": "1.0.0"
    },
 
  "frameworks": {
    "netstandard1.6": {
      "imports": "dnxcore50"
    }
  }
}

namespace Core1RtmEmptyTest.TagHelpers
{
    [HtmlTargetElement("list-group")]
    public class ListGroupTagHelper : TagHelper
    {
        [HtmlAttributeName("asp-items")]
        public List<string> Items { get; set; }
 
        public override void Process(TagHelperContext context, TagHelperOutput output)
        {
        }
    }
}

 <list-group></list-group>

 <list-group asp-items="Model.Items"></list-group>

using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;
 
namespace Core1RtmEmptyTest.TagHelpers
{
    [HtmlTargetElement("list-group")]
    public class ListGroupTagHelper : TagHelper
    {
        [HtmlAttributeName("asp-items")]
        public List<string> Items { get; set; }
 
        protected HttpRequest Request => ViewContext.HttpContext.Request;
 
        [ViewContext, HtmlAttributeNotBound]
        public ViewContext ViewContext { get; set; }
        public override void Process(TagHelperContext context, TagHelperOutput output)
        {
            if (context == null)
            {
                throw new ArgumentNullException(nameof(context));
            }
 
            if (output == null)
            {
                throw new ArgumentNullException(nameof(output));
            }
 
            if (Items == null)
            {
                throw new InvalidOperationException($"{nameof(Items)} must be provided");
            }
 
            output.TagName = "ul";
            output.TagMode = TagMode.StartTagAndEndTag;
            output.Attributes.Add("class", "list-group");
 
            foreach (var item in Items)
            {
                TagBuilder itemBuilder = new TagBuilder("li");
                itemBuilder.AddCssClass("list-group-item");
                itemBuilder.InnerHtml.Append(item);
                output.Content.AppendHtml(itemBuilder);
            }
        }
    }
}

 @addTagHelper *,Core1RtmEmptyTest.TagHelpers

just changing the color of the icon of the app in the store saw downloads increase by 23% or decrease by 19%.