Tag: Styles

Should CSS Override Default Browser Styles?

CSS overrides can change the default look of almost anything:

  • You can use CSS to override what a checkbox or radio button looks like, but if you don’t, the checkbox will look like a default checkbox on your operating system and some would say that’s best for accessibility and usability.
  • You can use CSS to override what a select menu looks like, but if you don’t, the select will look like a default select menu on your operating system and some would say that’s best for accessibility and usability.
  • You can override what anchor links look like, but some would say they should be blue with underlines because that is the default and it’s best for accessibility and usability.
  • You can override what scrollbars look like, but if you don’t, the scrollbars will look (and behave) the way default scrollbars do on your operating system, and some would say that’s best for accessibility and usability.

It just goes on and on…

In my experience, everyone has a different line. Nearly everybody styles their buttons. Nearly everybody styles their links, but some might only customize the hue of blue and leave the underline, drawing the line at more elaborate changes. It’s fairly popular to style form elements like checkboxes, radio buttons, and selects, but some people draw the line before that.

Some people draw a line saying you should never change a default cursor, some push that line back to make the cursor into a pointer for created interactive elements, some push that line so far they are OK with custom images as cursors. Some people draw the line with scrollbars saying they should never be customized, while some people implement elaborate designs.

CSS is a language for changing the design of websites. Every ruleset you write likely changes the defaults of something. The lines are relatively fuzzy, but I’d say there is nothing in CSS that should be outright banned from use — it’s more about the styling choices you make. So when you do choose to style something, it remains usable and accessible. Heck, background-color can be terribly abused making for inaccessible and unusable areas of a site, but nobody raises pitchforks over that.


Should CSS Override Default Browser Styles? originally published on CSS-Tricks

CSS-Tricks

, , , ,

Standardizing Focus Styles With CSS Custom Properties

Take two minutes right now and visit your current project in a browser. Then, using only the Tab key, you should be able to navigate between interactive elements including buttons, links, and form elements.

If you are sighted, you should be able to visually follow the focus as it jumps between elements in the DOM. But if you do not see any visual change, or only a barely noticeable visual change, then you’ve found the one thing you can do to make a big difference for your visitors.

We’re going to look at a technique to make your focus styles more manageable across your project by using CSS custom properties and learn about a modern CSS focus selector. But first, let’s learn more about why visible focus styles are important.

Meeting WCAG Focus Style Criteria

Visible focus states are covered in the Web Content Accessibility Guidelines (WCAG) Success Criterion 2.4.7 – Focus Visible. The Understanding doc for 2.4.7 states the following in the intent of this criteria:

The purpose of this success criterion is to help a person know which element has the keyboard focus. It must be possible for a person to know which element among multiple elements has the keyboard focus.

In the upcoming WCAG 2.2, a new criterion is being added to clarify “how visible the focus indicator should be.” While currently in draft, getting familiar with and applying the guidelines in 2.4.11 – Focus Appearance (Minimum) is definitely a positive step you can take today to improve your focus styles.

Managing focus style with CSS custom properties

A technique I’ve started using this year is to include the following setup early in my cascade on the primary base interactive elements:

:is(a, button, input, textarea, summary) {   --outline-size: max(2px, 0.08em);   --outline-style: solid;   --outline-color: currentColor; }  :is(a, button, input, textarea, summary):focus {   outline: var(--outline-size) var(--outline-style) var(--outline-color);   outline-offset: var(--outline-offset, var(--outline-size)); }

This attaches custom properties that allow you the flexibility to customize just parts of the outline style as needed to ensure the focus remains visible as the element’s context changes.

For --outline-size, we’re using max() to ensure at least a value of 2px, while allowing the possibility of scaling relative to the component (ex. a large button or link within a headline) based on 0.08em.

A property you might not be familiar with here is outline-offset which defines the space between the element and the outline. You can even provide a negative number to inset the outline, which can be very useful for ensuring contrast of the focus style. In our rule set, we’ve set that property to accept an optional custom property of --outline-offset so that it can be customized if needed, but otherwise it has the fallback to match the --outline-size.

Improvements for outline appearance

Over my career, I’ve both been asked to remove outlines and removed them myself because they were considered “ugly”.

There are now two reasons outline should absolutely never have cause to be removed (in addition to the accessibility impact):

  1. outline now follows border-radius in Chromium and Firefox! 🎉 This means you can considering removing any hacks you may have used, such as faking it with a box-shadow (which has another positive accessibility impact of ensuring focus styles aren’t removed for Windows High Contrast Theme users).
  2. Using :focus-visible we can ask the browser to use heuristics to only show focus styles when it detects input modalities that require visible focus. Simplified, that means mouse users won’t see them on click, keyboard users will still have them on tab.

It’s important to note that form elements always show a focus style — they are exempt from the behavior of :focus-visible.

So let’s enhance our rule set to add the following to include :focus-visible. We’ll keep the initial :focus style we already defined for older browsers so that it’s not lost just in case.

:is(a, button, input, textarea, summary):focus-visible {   outline: var(--outline-size) var(--outline-style) var(--outline-color);   outline-offset: var(--outline-offset, var(--outline-size)); }

Due to the way browsers throw out selectors they don’t understand, we do need to make these separate rules and not combine them even though they define the same outline properties.

Finally, we also need this kind of funny-looking :focus:not(:focus-visible) rule that removes the regular focus styles for browsers that support :focus-visible:

:is(a, button, input, textarea, summary):focus:not(:focus-visible) {   outline: none; }

Of note is that the latest versions of Chromium and Firefox have switched to using :focus-visible as the default way to apply focus styles on interactive elements, and just recently was enabled as default in webkit so it should be in Safari stable soon! Our rules are still valid since we’re customizing the outline appearance.

For more guidance on visible focus styles, I recommend Sara Soueidan’s amazing and thorough guide to focus indicators because it considers the upcoming 2.4.11 criterion.

Focus styles demo

This Pen shows examples of each of these interactive elements and how to apply customizations using the custom properties, including a few swaps for dark mode. Depending on your browser support, you may not see a focus style due to :focus-visible unless you use the tab key.

One final note: button is a unique interactive element when it comes to focus styles because it has additional considerations across its states, particularly if you are relying on color alone. For help with that, try out the palette generator from my project ButtonBuddy.dev.

CSS-Tricks

, , , ,
[Top]

Inline Styles as Classes (lol)

If you’re abhorred by using inline styles, just move that style to the class attribute! And then make sure you have CSS in place that, ya know, does what it says on the box.

OK lemme dig in and totally ruin the joke.

  • First off, it’s a joke, so don’t actually do this. I don’t even mind the occasional inline style for one-off stuff, but this is not that.
  • To me the weirdest part is that period (.) character. Escaping the more unusual characters with a backslash () feels normal, but what is that period about?
  • The little period trick there doesn’t work when the following character is a number (e.g. .padding:.1rem;).
  • You can avoid the escaping and trickery if you go with an attribute selector like [class*="display: flex;"].
  • This reminds me of Mathias Bynens’ research: CSS character escape sequences. But… that doesn’t seem to work anymore? I wonder if browsers changed or if the tool broke and doesn’t output what it should anymore (e.g. does .color3a #bada55; look right?).

Here’s all that playing around:


The post Inline Styles as Classes (lol) appeared first on CSS-Tricks.

You can support CSS-Tricks by being an MVP Supporter.

CSS-Tricks

, ,
[Top]

List Markers and String Styles

Lists—we’ve all worked with them in one form or another. I’m talking about HTML’s <ol> and <ul>. Much of the time, because we desire styling control, we turn off the list’s markers completely with list-style-type: none, and start styling from there. Other times, we choose from a very limited set of unordered list markers, such as disc, circle, or square; or a (much) wider range of ordered list markers. We might even, from time to time, supply the URL of an image to be used.

But what if we want to style the markers differently than the contents of the list items? That’s always been difficult at best. Now, thanks to the ::marker pseudo-element, it’s a whole lot easier. You don’t get the full range of CSS to apply to the markers, but there’s still a great deal that can be done.

::marker is available in Firefox and, thanks to work by Igalia, Chrome as well.

Consider this list:

By default, that will yield an ordered list numbered from 1 to 5, using Arabic numerals (1, 2, 3, etc.), each followed by a dot (period), all of which will match the text contents in font face, size, style, color, and so on.

If you had a design direction that required making the numbers smaller or a different color, you’d have to manually create that effect by suppressing the markers and using the ::before pseudo-element and CSS counters and negative text indenting and… well, it would take a scientist to explain it all.

Enter ::marker. Add these styles to the above list, and you’ll get the result shown after.

That’s all you need!

Before you go tearing off to rewrite all your CSS, though, beware: the properties you can apply via ::marker are fairly limited at the moment. As of February 2021, the properties that markers should recognize are:

  • All font properties (font-face, font-size, etc.)
  • The white-space property
  • The color property
  • The internationalization properties text-combine-upright, unicode-bidi, and direction
  • The content property
  • All animation and transition properties

There are some additions in some browsers, but almost all of the additions relate to text styling, not the box model. So if you were thinking you could put all your list numbers into circles with shaded backgrounds, ::marker won’t get you there—you’ll have to return to the hackfest of ::before generated content. For now, anyway: the specification explicitly says more properties may be permitted for ::marker in the future.

There’s also a limitation around white-space, which has rendering bugs in varying browsers. Chrome, for example, treats all whitespace in markers as white-space: pre as the specification says, but won’t let you change it. This should be fixed when Chrome’s LayoutNG (Next Generation) ships, but not until then. Firefox, on the other hand, ignores any white-space values, and treats whitespace like normal-flow text by default.

With those limits in mind, you can still jazz up your markers with the content property. Instead of numbers followed by a period, you can put each number in brackets with a combination of counters and strings.

Note the space after the closing bracket in the content value. That’s included to provide a little bit of space between the marker and the list content. Ordinarily you might think to use a marking or padding, but as we saw earlier, those properties can’t be applied with ::marker. Which is frustrating! Also note the CSS counter list-item. That wasn’t defined anywhere else in the CSS—it’s a built-in counter that all browsers (that understand CSS counters) use to count list items, like those in ordered lists. You can use it in your CSS as well!

If all you want to do is change the text content of a list marker and don’t care about changing any of its styles, you can do that with ::marker, or you can do it with the new cross-browser support for string values on the list-style-type property.

li.warning {   list-style-type:"⚠"; }

So that’s what’s new in the world of list markers. It might not be something you need to do often, but if you ever do, it’s good to know that the capabilities in this area have increased, and stand to be even better in the future. Let us know if you come up with some clever markers!


The post List Markers and String Styles appeared first on CSS-Tricks.

You can support CSS-Tricks by being an MVP Supporter.

CSS-Tricks

, , ,
[Top]

Custom Styles in GitHub Readme Files

Even though GitHub Readme files (typically ./readme.md) are Markdown, and although Markdown supports HTML, you can’t put <style> or <script> tags init. (Well, you can, they just get stripped.) So you can’t apply custom styles there. Or can you?

  1. You can use SVG as an <img src="./file.svg" alt="" /> (anywhere).
  2. When used that way, even stuff like animations within them play (wow).
  3. SVG has stuff like <text> for textual content, but also <foreignObject> for regular ol’ HTML content.
  4. SVG support <style> tags.
  5. Your readme.md file does support <img> with SVG sources.

Sindre Sorhus combined all that into an example.

That same SVG source will work here:


The post Custom Styles in GitHub Readme Files appeared first on CSS-Tricks.

You can support CSS-Tricks by being an MVP Supporter.

CSS-Tricks

, , , ,
[Top]

Copy the Browser’s Native Focus Styles

Remy documented this the other day. Firefox supports a Highlight keyword and both Chrome and Safari support a -webkit-focus-ring-color keyword. So if you, for example, have removed focus from something and want to put it back in the same style as the browser default, or want to apply a focus style to an element when it isn’t directly in focus itself, this can be useful.

For example:

button:focus + span {   outline: 5px auto Highlight;   outline: 5px auto -webkit-focus-ring-color; }

Looks good to me. It’s especially helpful with the sorta weird new Chrome double-outline style that would be slightly tricky to replicate otherwise.

Chrome 84
Safari 13.1
Firefox 80


The post Copy the Browser’s Native Focus Styles appeared first on CSS-Tricks.

You can support CSS-Tricks by being an MVP Supporter.

CSS-Tricks

, , , ,
[Top]

Chrome 83 Form Element Styles

There have been some aesthetic changes to what form elements look like as of Chrome 83. Anything with gradient colorization is gone (notably the extra-shiny <meter> stuff). The consistency across the board is nice, particularly between inputs and textareas. Not a big fan of the new <select> styling, but I hear a lot of accessibility research went into this, so it’s hard to complain there — plus you can always change it.

Hakim has a nice comparison tweet:

The Jetpack plugin for WordPress has a new comparison block and I’m going to try it out here. You can swipe between the items, just for fun (drag the slider in the middle):

This is not accompanied by new standardized ways to change the look of form elements with CSS, although browsers are well aware of that and seem to draw nearer and nearer all the time. I believe is was a step along that path.

I also see there is a new <input type="time"> as well. The old version looked like this and offered no UI controls:

Now we get this beast with controls:

There are no visual indicators or buttons, but you can scroll those columns.

Reddit notes that it uses the same pseudo element that date pickers use, so if you want it gone, you can scope it to these types of inputs (or not) and remove it.

input[type="time"]::-webkit-calendar-picker-indicator {   display: none; }

I’d call it an improvement (I like UI controls for things), but it does continue to highlight the need to be able to style these things, particularly if the goal is to have people actually use them and not (poorly) rebuild them.

The post Chrome 83 Form Element Styles appeared first on CSS-Tricks.

CSS-Tricks

, , ,
[Top]

Having a Little Fun With Custom Focus Styles

Every front-end developer has dealt or will deal with this scenario: your boss, client or designer thinks the outline applied by browsers on focused elements does not match the UI, and asks you to remove it. Or you might even be looking to remove it yourself.

So you do a little research and find out that this is strongly discouraged, because the focus outline is there for a reason: it provides visual feedback for keyboard navigation (using the Tab key), letting users who can’t use a mouse or have a visual impairment know where they are on the screen.

This button shows a focus state with Chrome’s default outline style.

That doesn’t mean you’re stuck with this outline, though. Instead of removing it, you can simply replace it with something else. That way, you’ll keep your interface accessible and get more flexibility on how it looks, so you can better match your UI.

You can start by removing the default browser outline by selecting the focused state of the element and applying outline: none. Then, you may choose from each of the options ahead to replace it:

Change the background color

This works best for elements that can be filled, such as buttons. Select the focused state of the element and apply a contrasting background color to it. The higher the contrast the better because subtle changes may not be strong enough visual cues, particularly in cases where with color blindness and low-vision.

In the example below, both background and border color change; you may pick either or both.

Click or focus with the Tab key to view how this state looks.

See the Pen
Elements replacing native outline focus with background color
by Lari (@larimaza)
on CodePen.

Change the text color

If the element has any text, you can select the focused state and change its color. This also works for icons applied with mask-image; you can select the icon as a descendant of the focused element and change its background color, like the example button below.

See the Pen
Elements replacing native outline focus with text and icon color
by Lari (@larimaza)
on CodePen.

Again, contrast is key. You may also consider using an underline on text links and making it part of the changed state because, as the Web Content Accessibility Guidelines state:

Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element. (Level A)
Understanding Success Criterion 1.4.1

Apply a box shadow

The box-shadow property can do exactly the same job as the outline, except it’s much more powerful — you can now control its color, opacity, offset, blur radius and spread radius. And if a border-radius is specified, the box shadow follows the same rounded corners.

See the Pen
Elements replacing native outline focus with box shadow
by Lari (@larimaza)
on CodePen.

You can get really creative with this technique (seriously though, don’t do this):

See the Pen
Elements replacing native outline focus with insane box shadow
by Lari (@larimaza)
on CodePen.

This works for virtually any type of focusable element, like toggles, checkboxes, radio buttons and slides.

See the Pen
Toggle and radio button replacing native outline focus with box shadow
by Lari (@larimaza)
on CodePen.

Increase the element’s size

As an alternative to color change, you may also resort to subtle size modification as focus feedback. In this example, we’re using transform: scale.

See the Pen
Elements replacing native outline focus with transform scale
by Lari (@larimaza)
on CodePen.

The key here is subtlety. Extreme size changes may cause content reflow, not to mention a poor experience for those who prefer reduced motion.

Replicate existing hover styles

If the element already has a contrasting hover style, you can simply take that style and apply it for the focused state as well. This is a rather elegant solution, as you don’t have to add any new colors or outlines to the interface.

Here’s an example where both the focus and hover states adopt a high contrast to the background of an element’s default style:

See the Pen
Elements replacing native outline focus with hover styles
by Lari (@larimaza)
on CodePen.

Bonus: Customize the default outline

Everything we’ve looked at so far takes the assumption that we want to remove the focus outline altogether. We don’t have to! In fact, it’s a border that we can customize.

button:focus {   outline: 3px dashed orange; }

That’s shorthand and could have been written this way if we want to fine-tune the styles:

button:focus {   outline-width: 3px;   outline-style: dashed;   outline-color: orange; }

One additional superpower we have is the outline-offset property, which is separate from the outline shorthand property but can be used alongside it to change the position of the focus ring:

button:focus {   outline: 3px dashed orange;   outline-offset: 10px; }

Conclusion

You can mix and match all of these options to get custom styles that look appropriate for each component type within your interface.

And it’s worth repeating: Don’t forget to use stark color contrasts and other visual cues in addition to color when adopting custom focus states. Sure, we all want an experience that aligns with our designs, but we can adhere to good accessibility practices in the process. The W3C recommends this tool to test the contrast of colors values against the WCAG guidelines.

The post Having a Little Fun With Custom Focus Styles appeared first on CSS-Tricks.

CSS-Tricks

, , , ,
[Top]

What I Like About Writing Styles with Svelte

There’s been a lot of well-deserved hype around Svelte recently, with the project accumulating over 24,000 GitHub stars. Arguably the simplest JavaScript framework out there, Svelte was written by Rich Harris, the developer behind Rollup. There’s a lot to like about Svelte (performance, built-in state management, writing proper markup rather than JSX), but the big draw for me has been its approach to CSS.

Single file components

​​

React does not have an opinion about how styles are defined
—React Documentation

​​​​

A UI framework that doesn’t have a built-in way to add styles to your components is unfinished.
—Rich Harris, creator of Svelte

In Svelte, you can write CSS in a stylesheet like you normally would on a typical project. You can also use CSS-in-JS solutions, like styled-components and Emotion, if you’d like. It’s become increasingly common to divide code into components, rather than by file type. React, for example, allows for the collocation of a components markup and JavaScript. In Svelte, this is taken one logical step further: the Javascript, markup and styling for a component can all exist together in a single `.svelte`​ file. If you’ve ever used single file components in Vue, then Svelte will look familiar.

// button.svelte <style>   button {     border-radius: 0;     background-color: aqua;   } </style>  <button>   <slot/> </button>

Styles are scoped by default

By default, styles defined within a Svelte file are scoped. Like CSS-in-JS libraries or CSS Modules, Svelte generates unique class names when it compiles to make sure the styles for one element never conflict with styles from another.

That means you can use simple element selectors like div and button in a Svelte component file without needing to work with class names. If we go back to the button styles in our earlier example, we know that a ruleset for <button> will only be applied to our <Button> component — not to any other HTML button elements within the page. If you were to have multiple buttons within a component and wanted to style them differently, you’d still need classes. Classes will also be scoped by Svelte.

The classes that Svelte generates look like gibberish because they are based on a hash of the component styles (e.g. svelte-433xyz). This is far easier than a naming convention like BEM. Admittedly though, the experience of looking at styles in DevTools is slightly worse as the class names lack meaning.

The markup of a Svelte component in DevTools.

It’s not an either/or situation. You can use Svelte’s scoped styling along with a regular stylesheet. I personally write component specific styles within .svelte files, but make use of utility classes defined in a stylesheet. For global styles to be available across an entire app — CSS custom properties, reusable CSS animations, utility classes, any ‘reset’ styles, or a CSS framework like Bootstrap — I suggest putting them in a stylesheet linked in the head of your HTML document.

It lets us create global styles

As we’ve just seen, you can use a regular stylesheet to define global styles. Should you need to define any global styles from within a Svelte component, you can do that too by using :global. This is essentially a way to opt out of scoping when and where you need to.

For example, a modal component may want to toggle a class to style the body element:

<style> :global(.noscroll) {   overflow: hidden; } </style>

Unused styles are flagged

Another benefit of Svelte is that it will alert you about any unused styles during compilation. In other words, it searches for places where styles are defined but never used in the markup.

Conditional classes are terse and effortless

If the JavaScript variable name and the class name is the same, the syntax is incredibly terse. In this example, I’m creating modifier props for a full-width button and a ghost button.

<script>   export let big = false;   export let ghost = false; </script>  <style>   .big {     font-size: 20px;     display: block;     width: 100%;   }      .ghost {     background-color: transparent;     border: solid currentColor 2px;   } </style>          <button class:big class:ghost>   <slot/> </button>

A class of ghost will be applied to the element when a ghost prop is used, and a class of big is applied when a big prop is used.

<script>   import Button from './Button.svelte'; </script>  <Button big ghost>Click Me</Button>

Svelte doesn’t require class names and prop names to be identical.

<script>   export let primary = false;   export let secondary = false; </script>  <button   class:c-btn--primary={primary}   class:c-btn--secondary={secondary}   class="c-btn">   <slot></slot> </button>

The above button component will always have a c-btn class but will include modifier classes only when the relevant prop is passed in, like this:

<Button primary>Click Me</Button>

That will generate this markup:

<button class="c-btn c-btn--primary">Click Me</button>

Any number of arbitrary classes can be passed to a component with a single prop:

<script> let class_name = ''; export { class_name as class }; </script>  <button class="c-btn {class_name}">   <slot /> </button>

Then, classes can be used much the same way you would with HTML markup:

<Button class="mt40">Click Me</Button>

From BEM to Svelte

Let’s see how much easier Svelte makes writing styles compared to a standard CSS naming convention. Here’s a simple component coded up using BEM.

.c-card {   border-radius: 3px;   border: solid 2px; }  .c-card__title {   text-transform: uppercase; }  .c-card__text {   color: gray; }  .c-card--featured {   border-color: gold; }

Using BEM, classes get long and ugly. In Svelte, things are a lot simpler.

<style> div {   border-radius: 3px;   border: solid 2px; }  h2 {   text-transform: uppercase; }  p {   color: gray; }  .featured {   border-color: gold; } </style>  <div class:featured>   <h2>What I Like About Writing Styles with Svelte</h2>   <p>     <slot />   </p> </div>

It plays well with preprocessors

CSS preprocessors feels a lot less necessary when working with Svelte, but they can work perfectly alongside one another by making use of a package called Svelte Preprocess. Support is available for Less, Stylus and PostCSS, but here we’ll look at Sass. The first thing we need to do is to install some dependencies:

npm install -D svelte-preprocess node-sass

Then we need to import autoPreprocess in rollup.config.js at the top of the file.

import autoPreprocess from 'svelte-preprocess';

Next, let’s find the plugins array and add preprocess: autoPreprocess() to Svelte:

export default {   plugins: [     svelte({       preprocess: autoPreprocess(),       ...other stuff

Then all we need to do is specify that we’re using Sass when we’re working in a component file, using type="text/scss" or lang="scss" to the style tag.

<style type="text/scss">   $ pink: rgb(200, 0, 220);   p {     color: black;     span {       color: $ pink;     }   } </style>

Dynamic values without a runtime

We’ve seen that Svelte comes with most of the benefits of CSS-in-JS out-of-the-box — but without external dependencies! However, there’s one thing that third-party libraries can do that Svelte simply can’t: use JavaScript variables in CSS.

The following code is not valid and will not work:

<script>   export let cols = 4; </script>  <style>   ul {     display: grid;     width: 100%;     grid-column-gap: 16px;     grid-row-gap: 16px;     grid-template-columns: repeat({cols}, 1fr);   } </style>  <ul>   <slot /> </ul>

We can, however, achieve similar functionality by using CSS variables.

<script>   export let cols = 4; </script>  <style>   ul {     display: grid;     width: 100%;     grid-column-gap: 16px;     grid-row-gap: 16px;     grid-template-columns: repeat(var(--columns), 1fr);   } </style>  <ul style="--columns:{cols}">   <slot /> </ul>

I’ve written CSS in all kinds of different ways over the years: Sass, Shadow DOM, CSS-in-JS, BEM, atomic CSS and PostCSS. Svelte offers the most intuitive, approachable and user-friendly styling API. If you want to read more about this topic then check out the aptly titled The Zen of Just Writing CSS by Rich Harris.

The post What I Like About Writing Styles with Svelte appeared first on CSS-Tricks.

CSS-Tricks

, , , ,
[Top]

Weekly Platform News: Preventing Image Loads with the Picture Element, the Web We Want, Svg Styles Are Not Scoped

In this week’s week roundup of browser news, a trick for loading images conditionally using the picture element, your chance to tell bowser vendors about the web you want, and the styles applied to inline SVG elements are, well, not scoped only to that SVG.

Let’s turn to the headlines…

Preventing image loads with the picture element

You can use the <picture> element to prevent an image from loading if a specific media query matches the user’s environment (e.g., if the viewport width is larger or smaller than a certain length value). [Try out the demo:

See the Pen
voZENR
by Šime Vidas (@simevidas)
on CodePen.

<picture>   <!-- show 1⨯1 transparent image if viewport width ≤ 40em -->   <source     media="(max-width: 40em)"     srcset="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"   />    <!-- load only image if viewport width > 40em -->   <img src="product-large-screen.png" /> </picture>

(via Scott Jehl)

The Web We Want

The Web We Want (webwewant.fyi) is a new collaboration between browser vendors that aims to collect feedback from web developers about the current state of the web. You can submit a feature request on the website (“What do you want?””) and get a chance to present it at an event (An Event Apart, Smashing Conference, etc.).

(via Aaron Gustafson)

In other news

  • Firefox supports a non-standard Boolean parameter for the location.reload method that can be used to hard-reload the page (bypassing the browser’s HTTP cache) [via Wilson Page]
  • If you use inline <svg> elements that itself have inline CSS code (in <style> elements), be aware that those styles are not scoped to the SVG element but global, so they affect other SVG elements as well [via Sara Soueidan]
  • XSS Auditor, a Chrome feature that detects cross-site scripting vulnerabilities, has been deemed ineffective and will be removed from Chrome in a future version. You may still want to set the HTTP X-Xss-Protection: 1; mode=block header for legacy browsers [via Scott Helme]

Read more news in my new, weekly Sunday issue. Visit webplatform.news for more information.

The post Weekly Platform News: Preventing Image Loads with the Picture Element, the Web We Want, Svg Styles Are Not Scoped appeared first on CSS-Tricks.

CSS-Tricks

, , , , , , , , , ,
[Top]