two compilers: ˜ Full Codegen A simple and very fast compiler that produced simple and relatively slow machine code ˜ Crankshaft A more complex (Just-In-Time) optimizing compiler that produced highly-optimized code
destructuring ~ try-catch and try-finally ~ Compound let or const assignment ~ Object literals that contain __proto__, or get or set declarations. ~ debugger or with statements ~ Literal calls to eval() ~ …
destructuring ~ try-catch and try-finally ~ Compound let or const assignment ~ Object literals that contain __proto__, or get or set declarations. ~ debugger or with statements ~ Literal calls to eval() ~ …
early connections before an HTTP request is actually sent to the server. This includes: ˜ DNS lookups ˜ TLS negotiations ˜ TCP handshakes This in turn: ✔ Eliminates roundtrip latency ✔ Saves time for users
preload directive include: ✔ Gives the browser the ability to determine the resource type (it can tell if the same resource can be reused in the future) ✔ The browser can determine if the request is compliant with the content security policy ✔ The browser can send the appropriate accept headers based on resource type
the browser to fetch resources, store them in cache, assuming that the user will request them. <link rel="prefetch" href="/uploads/images/pic.png"> ˜ What can $% do…
the browser to perform DNS lookups on a page in the background while the user is browsing. <link rel=“dns-prefetch” href="#$fonts.googleapis.com"> ˜ What can $% do…
the browser to render the entire page in the background, all the assets of a document. <link rel=“prerender” href=“https://xandaviao.com.br/”> ˜ What can $% do…
the browser to render the entire page in the background, all the assets of a document. <link rel=“prerender” href=“https://xandaviao.com.br/”> ˜ What can $% do… ⚠ ❌ ❌ ⚠
the browser to render the entire page in the background, all the assets of a document. <link rel=“prerender” href=“https://xandaviao.com.br/”> ˜ What can $% do… ✘ You want to be more careful with prerendering as it is resource heavy and can cause bandwidth waste, especially on mobile devices
as it is necessary for the core user experience ''( <script src=foo importance=critical> %%%& An image is to be loaded with high importance. It could be important but not critical to the overall experience loading up. ''( <img src=foo importance=high> %%%& It can be used to indicate low importance/non-blocking style which isn't impacting the core experience. ''( <link rel=stylesheet href=foo importance=low>
to the parent chunk ˜ Focuses on current navigation ˜ Fetches resources with high-priority ˜ Is instantly downloaded ˜ Starts after the parent chunk finish ˜ Focuses on fetching resources for the next navigation ˜ Fetches resources with low priority ˜ Is downloaded in browser idle time
font-family: "Open Sans Regular"; src: url(“./OpenSans-Regular-BasicLatin.woff2") format("woff2"); font-display: swap; } ˜ What it does… The initial font displayed is the first system font in the stack. When the custom font has loaded, it will kick in and replace the system font that was initially displayed.
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